As a longstanding partner of armed forces around the globe, Rheinmetall supplies a wide array of mortar systems and ammunition. The assistant gunner checks the bipod and ensures that--. They use the M5 propelling charge that consists of eight cloth bags attached to the tail unit. It is assembled with the M772A1 MTSQ. With the clamps facing away from him, the assistant gunner traverses the buffer carrier to the traversing handwheel and folds the handle. The gunner checks the baseplate and ensures that--. The barrel clamps are then closed. (1) The M935 fuze has two function settings: impact and delay. He may assist the gunner in shifting the mortar when the gunner is making large deflection changes. When a misfire occurs, any member of the squad immediately announces, "Misfire." The following safety checks must be enforced before firing the mortar. The round is still safe to handle and transport if the safety wire is reinserted. Close approach to crests, trees, towers, large buildings, parked aircraft, mechanized equipment, and similar irregularities causes functioning at heights greater than average level. Fired . b. . The M252 81mm Medium Extended Range Mortar is a crew-served, medium weight mortar which is highly accurate and provides for a greater range (4,500 meters to 5,650 meters) and lethality than the . 0.50, BROWNING, M2; FIRING CARTRIDGE, ARMOR-PIERCING-INCENDIARY, CAL. High angles of approach (near vertical) give the lowest burst heights. MORTAR RANGE: 500M X 100M X: FIELD TRAINING AREA 40000 Sq Ft: X STORAGE BUILDING, GENERAL PURPOSE, INSTALLATION: Area to store excess equipment X: ORGANIZATIONAL STORAGE BUILDING Arms room for Mortar equipment: X . The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. The mortar also offered the promised increase in range as well, allowing fire teams to engage the enemy at distance. c. The assistant gunner stands to the right of the mortar, facing the barrel and ready to load. The body is made of aluminum and brass. The 0-second boss is wider and differs in shape from the other body bosses; the safe setting position is indicated by the letter "S" on the fuze body. Range Minimum to maximum 83 to 5,608 meters Rate of Fire . REFERRING OF THE SIGHT AND REALIGNMENT OF AIMING POSTS USING M64 SIGHT. The term "danger close" is included in the call for fire when there are friendly troops or positions within a prescribed distance of the target, specifically 600 meters for artillery or mortars . (2) Burn all dead grass or brush within 30 meters around the burning place. The M252 system . The safety wire must be removed before firing. Long Range PGK. b. The gunner should expose 6 inches (150 millimeters) of elevation shaft and center the buffer carrier. The safety pull wire is removed just before inserting the cartridge into the mortar. The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. The fuze consists of a brass head, body assembly, and expelling charge. This section discusses the. He makes large deflection shifts by shifting the bipod assembly and keeps the bubbles level during firing. c. Crest Clearance. With the mortar mounted and the sight installed, the gunner lays the sight on the two aiming posts (placed out 50 and 100 meters from the mortar) on a referred deflection of 2800 mils and an elevation of 1100 mils. The M252 81 mm medium weight mortar is a British designed smooth bore, muzzle-loading, high-angle-of-fire weapon used for long-range indirect fire support to light infantry, air assault, and airborne units across the entire front of a battalion zone of influence. The aluminum tail assembly has six integral fins equally spaced around the rear, which stabilize the round in flight. He maintains the ammunition for firing and provides local security for the mortar position. 0.50, M8 (REPRINTED W/BASIC INCL C1-2) (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR MACHINE GUN, CALIBER .50: BROWNING, M2 (HEAVY BARREL, TURRET TYPE) ON MOUNT, MACHINE GUN, TRAILER MOUNTED: MULTIPLE CALIBER .50 MACHINE GUN, M55 FIRING CARTRIDGE, CALIBER .50: API, M8 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR MACHINE GUN, CALIBER .50: FICED, M85 TANK, COMBAT, FULL TRACKED: 105MM GUN, M60 SERIES FIRING CARTRIDGE, CALIBER .50: API, M8 CARTRIDGE, CALIBER .50: API-T M20 CARTRIDGE, CALIBER .50: BALL, M33 CARTRIDGE, CALIBER .50: TRACER, M17 (S&I BY PROP SEE DETAILS, FOOTNOTES), MACHINE GUN, CAL. It should be destroyed in accordance with standard procedures. It is especially useful if the baseplate sinks deep into the ground during prolonged firing. With the mortar mounted and the sight installed, the gunner lays the sight on the two aiming posts (placed out 50 and 100 meters from the mortar) on a referred deflection of 2800 mils and an elevation of 1100 mils. This is the inert PD fuze type "IR-81" used by the Italians for their 81mm mortar rounds during WWII. He is also the squad driver. He positions the lower barrel clamp against the lower stop band on the barrel and secures the upper barrel clamp. Ammunition is typed according to use (Table 4-2). It has a time setting of up to 50 seconds. The gunner is given an administrative command to lay the mortar on a deflection of 2860 or 2740 mils. a. The squad leader indicates the direction of fire when mounting. a. It provides illumination for about 60 seconds with 600,000 candlepower illumination. HE ammunition is used against personnel and materiel. a. Before-firing checks include the following: (1) Ammunition should be free of moisture, rust, and dirt. OPERATOR`S MANUAL FOR MORTAR, 81-MM, M252 (NSN 1015-01-164-6651) (EIC 4SK){TM . Attached to the arm is the cross-leveling mechanism, which is attached to the clamp assembly at its upper end. (4) The M567 fuze is an impact fuze that has a SQ/IMP or D function. b. Normally, it can be moved by hand, although this may be difficult to do if the mortar is moved through a large arc. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the 4-4. Official websites use .mil The fuze threads and fuze well threads are inspected for damage. The M532 fuze is a radio doppler fuze that has a proximity (PROX) or SQ/IMP function. Then it is removed from the bipod and laid horizontally on the ground at the dud pit until it can be turned over to ordnance personnel. The first ammunition bearer holds the barrel until the assistant gunner has removed the mount. It is painted white with black markings. High explosive--M821, M889, M374-series, and M362. Mount An official website of the United States government. This ensures a maximum traversing and elevating capability after making the movement. This may preclude moving the bipod. .30, BROWNING, M1919A4 AND M2 (HEAVY BARREL), .30, M2 (REPRINTED W/BASIC INCL C1) (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, MACHINE: CAL. He exposes 4 inches (100 millimeters) of elevation shaft and folds the handle. Swifty 3 from scratch; Swifty 3 split-repo setup; Swifty Troubleshooting; Mods. The fuze contains a delayed arming feature that ensures the fuze remains unarmed and detonator safe for a minimum of 1.25 seconds of flight. At the command, MARCH ORDER, the squad places the mortar, equipment, and ammunition in the squad vehicle and trailer. The assistant gunner carries the bipod to the front of the barrel and places the bipod feet on the ground 12 to 15 inches in front of the baseplate and astride the line of fire. Maximum Range (meters): 7,240 (with standard fuze) . The M751 is fitted with a smoke charge that operates on impact. The fuzes may be used for day or night operations. The M374 cartridge is fitted with the M90 propelling charge. For those of you in the market for a Dummy/Display 81mm mortar, I hope this article can answer a few of your questions before you order. The 0-second boss is wider and differs in shape from the other body bosses; the safe setting position is indicated by the letter "S" on the fuze body. e. The gunner centers the elevation bubble. To make the shift, the gunner places the fingers of his right hand in the muzzle and his left hand on the left leg. Identification. The M252 81 mm medium weight mortar is a British-designed smooth bore, muzzle-loading, high-angle-of-fire weapon used for long-range indirect fire support to light infantry, air assault, and airborne units across the entire front of a battalion zone of influence. (8) To help minimize the occurrence of short rounds and or duds, unpackaged ammunition that has been dropped should not be fired. That is generally how I use mortars. b. (d) Firing is slowed if mask clearance must be checked before each firing but this can be eliminated if minimum mask clearance is determined. The gunner levels the elevation bubble by turning the elevation micrometer knob and reading the setting on the elevation scale and elevation micrometer--this setting is the minimum mask clearance. M224A1 60 MM LWCMS Mortar The 60mm mortar, M224A1 Lightweight Company Mortar System (LWCMS), is a smoothbore, muzzle loaded, high angle of fire weapon. Following the arm-and-hand signals of the gunner (who is looking through the sight unit), he moves the far aiming post so that the gunner obtains an aligned sight picture. CANNON . The cannon has a crew-removable breech plug and firing pin. The traversing screw assembly is fitted to the clamp assembly, which is pivoted in the center on an arm attached to the elevating leg. Mortars are indirect-fire weapon systems. The RSTA squadron only receives the 120mm mounted mortar, there is no augmentation dismounted maneuvers. I say 120s are bad because they suffer from terrible dispersion even when not shooting at 6km. The pile is covered with a double thickness of tarpaulin. The propellant increments are ignited, which produce rapidly expanding gases that force the cartridge from the barrel. The first table is a chart that shows range and elevation for firing particular mortar shells. As soon as the sight data are announced, the gunner places it on the sight, lays the mortar for elevation, and traverses onto the aiming post by turning the traversing handwheel and adjusting nut in the same direction. The gunner then kicks the barrel several times with his heel in an attempt to dislodge the round. Both the M90 and M90A1 propellants are in nine wax-tested, cotton cloth, bag increments assembled to the tail unit. He places the sight case and aiming posts to the left front of the mortar position. These are NDI items . Secure .mil websites use HTTPS (3) The securing strap is correctly located, securing the barrel clamps and buffers to the plain leg. While the assistant gunner supports the barrel, the gunner slackens the leg-locking handwheel, releases the locating catch, and positions the plain leg. . The M1 became the standard American . (See FM 7-90 for a discussion of the duties of the platoon headquarters.). Do not burn increments in piles but spread them in a train 1 to 2 inches deep, 4 to 6 inches wide, and as long as necessary. If not, he may still fire at the desired range by selecting a charge zone having a higher elevation. (2) The breech plug is screwed tightly to the barrel. The components of the mortar consist of a cannon, mount, and baseplate. If the mortar section is to operate quickly and effectively in accomplishing its mission, mortar squad members must be proficient in individually assigned duties. It is constructed from ductile cast iron and contains about 1.5 pounds of cyclonite (RDX)/trinitrotoluene (TNT) composition explosive. 107 Army Pentagon The gunner unlocks the barrel clamp and rotates the barrel, unlocking the breech plug from the rotating socket of the baseplate. System (including basic issue items) Once set to act as an impact fuze, the mechanism cannot be reset for PROX. The sight is laid on two aiming posts (placed out 50 and 100 meters from the mortar) on a referred deflection of 2800 mils and an elevation of 1100 mils. The M375A3 cartridge is ballistically similar to the M374A3 (HE) cartridge. However, since explosives are affected by moisture and high temperature, they must be protected. high-explosive bomb at a range of about three miles. Correct way to open an ammunition box. Placing the mortar in position at night does not relieve the gunner of the responsibility of checking for mask clearance and overhead interference. Safety before firing is provided by a safety wire, which must be removed just before firing. (5) Four inches of elevation shaft are exposed, and the shaft is not bent. These cartridges are used first in subsequent firing so that once-opened stocks can be kept to a minimum. M120/M121 120 mm Mortar. The sight bracket is attached to the buffer carrier, which is fitted to the traversing screw assembly. The bipod provides front support for the barrel and carries the gears necessary to lay the mortar. At the same time, the first ammunition bearer moves out on the double to realign the aiming posts. The squad leader notifies the FDC of the minimum mask clearance elevation. (2) The M524-series fuze has two function settings: superquick/impact (SQ/IMP) and delay. a. This cartridge is ballistically matched to the M374A2, M374A1, and M375 HE cartridges, and weighs about 9.12 pounds. All elements given in the fire command are repeated by the squad. It is used for records such as reports on condition, malfunctions, and accidents. The wrench (P/N 9349539) sets M772 MT and M768 time fuzes. WP cartridges are stored with the fuze end up. They contain about 2.10 pounds of composition B explosive. They are assembled with either an M524-series, M526-series, or M567 fuze. General Dynamics Ordnance and Tactical Systems is the leading manufacturer of propellants for 60mm, 81mm and 120mm Mortar Systems. The vertical cross line of the sight is on the left edge of the aiming point. The lower clamp is shaped and bored on each side to house the buffer cylinders. f. Installation. a. 81mm smoothbore mortar Barrel length 1.28 m Muzzle velocity 225 m/s Elevation +45 to +85 Traverse 18 Fire control Sights C2 indirect fire sight with illumination Firepower Rate of fire 20 rpm maximum 15 rpm normal 1 to 12 rpm sustained Range 5.650 m maximum 100 m minimum Media 81mm L16A2 The M252 medium mortar offers a compromise between the light and heavy mortars. a. b. No tools are needed to set the fuze, and the setting can be changed several times without damaging the fuze. The platoon leader commands the platoon and supervises the training of the elements. The M252 81mm medium extended range mortar (see diagram below) is a crew-served, smooth bore, muzzle loaded, high angle of fire weapon system. The settings are obtained from the range tables and are applied using a wrench (number 9239539) or a 1 3/4-turn open-end wrench. Weights (pounds) System (including basic issue items) Barrel (with blast attenuator device) Mount M3A1 Baseplate c. The first ammunition bearer ensures that each cartridge is clean, the safety pin is present, and the ignition cartridge is in good condition. c. The gunner grasps both ends of the traverse screw assembly and supports the mortar during the subsequent drill. The mortar should be within two turns of center of traverse when the task is compete. . A securing strap is attached to the plain leg for securing the bipod in the folded position. The assistant gunner places his right hand palm up (1 inch from the muzzle end) under the BAD and his left hand palm down (1 inch from the muzzle end) on top. This section discusses the characteristics and nomenclature of each component (Figure 4-2). The standard infantry support weapon is the M-252 81mm mortar, which lobs a 10 lb. MC Medical Guide; Client-side mods; TFAR 1.x for players; b. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the The assistant gunner cleans the bore and swabs it dry. Theme by TechDoc. He then checks the sight picture to ensure he is within 20 mils of a proper sight picture. e. The assistant gunner passes the round to the first ammunition bearer who inspects it for the cause of the misfire. MFCS Mounted. (4) The bipod locking latch is locked, securing the barrel clamps. The cartridge can be fitted with the M524-series, M526-series, M567, or M532 fuzes. MFCS Dismounted. After the barrel cools, the gunner removes the sight and firing pin. End this starting train with not less than 1 meter of inert material (dry grass, leaves, or newspapers). The 81mm weapons platoon consisted of the headquarters platoon and four mortar squads. LARGE DEFLECTION AND ELEVATION CHANGES. (703) 614-3727, Office of the Chief Information Officer Cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. The gunner moves the mortar as the assistant gunner steadies it. (3) From this train, extend a starting train that will burn against the wind of single increments laid end to end. Features: The M252 81mm Medium Extended Range Mortar is a crew-served, medium weight mortar which is highly accurate and provides for a greater range (4,500 meters to 5,650 meters) and lethality than the previous 81mm mortar. 4-11. c. Authorized Cartridges. He indicates the initial direction of fire by pointing in that direction and commands ACTION. c. Upon receiving the command REFER, REALIGN AIMING POST, two actions take place at the same time in the mortar squad. c. The M375A2, M375A1, and M375 cartridges may also be used. Designed by Thingsym. b. The M853 cartridge (M252 only) has a cylindrical body that contains an illuminating candle and parachute assembly. When the approximate alignment is completed, the gunner signals the assistant gunner to lower the bipod by pushing down on the mortar. 120mm IHE grenade DM91. If required, the gunner/assistant gunner lowers the barrel so that the breech plug engages with the open end of the socket, and he uses the barrel as a lever to move the socket. At this command, the squad proceeds as follows: a. It contains white phosphorus that produces white smoke on contact with air. In any case, the gunner must ensure that the cartridge does not strike an obstacle. (c) The gunner determines mask and overhead clearance by sighting along the barrel with his eye near the breech plug. The squad leader stands behind the mortar where he can command and control his squad. It engages the 1 3/4-inch flats on the setting ring or the fuze head. The air burst over average types of soil ranges from 1 to 6 meters, depending on the angle of approach. Before the mortar is mounted, the squad must perform premount checks. CANNON, 155MM HOWITZER, M185 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A1 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A1B HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A2 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A4 AND CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5, M109A6 AND M109A7 AND CANNON, 155MM HOWITZER, M284A2 CHROME ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND M109A7 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777, M777A1 AND M777A2 AND CANNON, 155MM HOWITZER, M776 CHROME ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, M795 PROJECTILE, HE, M795 IM PROJECTILE, HE, M1122 PROJECTILE, IR ILLUMINATING, M1123 PROJECTILE, ILLUMINATING, M1124 INCLUDES FIRING TABLES FOR PROPELLANTS: M119A2 (CHARGE 7R), M203A1 (CHARGE 8S), AND MODULAR ARTILLERY CHARGE SYSTEM (MACS) PROPELLANTS: M231 (CHARGES 1L AND 2L), M232 AND M232A1 (CHARGES 3H, 4H AND 5H) (S&I BY PROP SEE DETAILS, FOOTNOTES) . Remaining increments are repositioned towards the rear of the tail fin assembly when firing the cartridge with horseshoe-shaped increments at less than full charge. Upon completion of any bipod movement on the barrel, the gunner ensures that the firing pin recess is facing upward. The 60mm mortar section is located in the weapons platoon of the rifle company, is armed with three 60mm mortars, and is It uses the M205 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. 1:4 For the 81MM Mortar System: X NSN (LIN): 1015-01-441-3113 : STAFF SECTION, CLEANING, ARTILLERY 1:4: The elevation change announced must be less than 90 mils and more than 35 mils. In addition to loading, he swabs the bore after 10 rounds have been fired or after each fire mission. The mortar is then re-laid on the aiming posts using the traversing crank. 81 mm HE mortar projectiles generally contain anywhere between 400 g and 680 g of HE and have a maximum range of approximately 6,500 m. 82 mm HE mortar projectiles generally contain anywhere between 392 g and 680 g of HE and have maximum ranges of between 3,000 - 5,500 m. Correctly applying and performing these duties enables the mortar section to perform as an effective fighting team. M252 81mm Mortars The M252 81mm medium extended range mortar (see diagram below) is a crew-served, smooth bore, muzzle loaded, high angle of fire weapon system. The increments are individually wrapped with waterproof bags that are not removed. The cartridge uses the M205 propelling charge and is assembled with the M567 or M524-series fuze. VERY NICE condition! Illuminating is used for battlefield illumination and signaling. It can be set from 3 to 55 seconds at half-second intervals. The assistant gunner exposes 8 inches (200 millimeters) of elevation shaft, leaving the elevation handwheel unfolded. d. The gunner recovers the baseplate to the area designated by the squad leader. The cartridges are returned to their original containers. Table 4-1. b. He places his thumbs alongside the forefingers, being careful to keep both hands away from the muzzle. Red phosphorus/white phosphorus is used for screening, producing casualties, creating incendiary effects, and signaling. A spring-loaded locating catch is behind the elevating gear housing, which locates the plain leg in its supporting position for level ground. c. The assistant gunner disengages the barrel clamps and moves the bipod from the immediate area of the mortar position. HE Guided Mortar is in development. It is a smooth-bore, muzzle-loading, high-angle-of-fire weapon used for long-range indirect fire support to light infantry, air assault, and airborne units across the entire front of a battalion zone of influence. Tabular Firing Tables TFT ORDER FORM 1.Select "Mortar" 2.Select which mortar caliber 3.Select mortar system nomenclature 4.Select which TFTs to order 5.Put in quantity and click "Add TFTs" 6.Click "Next" TFT JUSTIFICATION 1.Put in TFT Ordering Justification 2.Click "Next" SHIPPING INFORMATION 1.Fill out all required fields c. The assistant gunner moves into position to the front of the bipod on his right knee and grasps the bipod legs (palms up), lifting until they clear the ground enough to permit lateral movement. Complete cartridges are always handled with care. 81-mm MORTAR, M252 The 81-mm mortar, M252, delivers timely, accurate fires to meet the . The BAD is removed only by qualified maintenance personnel. It is light enough to be portable when broken down into. . They function normally in light rain; however, heavy rain, sleet, or snow can cause an increase in the number of early bursts. All mortar cartridges are painted to prevent rust and to identify their type. Table 4-3. Each round is stenciled with the ammunition lot number, type of round, type of filler, and caliber. Agreed that mortars should generally be used close to the frontline. It is designed to be fired in the indirect fire mode, cannot be fired handheld, and normally utilizes a FDC. The fuze is screwed into the cartridge body, and it is seated and secured using an M18 wrench. Notches in the setter engage ribs in the setting ring of the fuze. Table 4-2. (a) Since the mortar is normally mounted in defilade, there could be a mask such as a hill, tree, building, or rise in the ground. XM1210. .50: BROWNING, M2 (HEAVY BARREL, FLEXIBLE) ON MOUNT, MACHINE GUN, TRIPOD MTD, CAL. The safety/packing clip should be removed when the cartridge is unpacked. Prev - Mk6 Mortar range table for charge 0 Next - Mk6 Mortar range table for charge 2 . The fuze body is graduated from 0 to 25 seconds in 1-second intervals; 5-second intervals are indicated by bosses. The cartridge weighs about 9.12 pounds. To set for delay, the selector slot should be rotated clockwise until it is aligned with the "D" mark on the ogive. The cannon assembly consists of the barrel that is sealed at the lower end with a removable breech plug, which houses a removable firing pin (Figure 4-3). He releases the securing strap, loosens the leg-locking handwheel, and lowers the plain leg until the locating catch engages in the recess. Army Publishing Directorate The M374A2 and M374A1 cartridges are fitted with the M90A1 propelling charge. ), FIRING TABLES FOR, CANNON, 155MM, HOWITZER, M185 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1B HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A2 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A4 AND CANNON, 155MM, HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A5 AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A6 AND CANNON, 155MM, HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM, HOWITZER, XM776 ON HOWITZER, MEDIUM, TOWED, 155MM, XM777 FIRING PROJECTILE, HE, M795 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5, M109A6 AND M109A7 AND CANNON, 155MM HOWITZER, M284A2 CHROME ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND M109A7 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777, M777A1 AND M777A2 AND CANNON, 155MM HOWITZER, M776 CHROME ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, SMOKE, WP, M1121 INCLUDES FIRING TABLES FOR PROPELLANTS: M119A2 (CHARGE 7R), M203A1 (CHARGE 8S), AND MODULAR ARTILLERY CHARGE SYSTEM (MACS) PROPELLANTS: M231 (CHARGES 1L AND 2L), M232 AND M232A1 (CHARGES 3H, 4H AND 5H) (S&I BY PROP SEE FOOTNOTES). (4) Extra increments are removed if the cartridge is to be fired with less than full charge. (b) In selecting the exact mortar position, the leader looks quickly for mask clearance and overhead interference. 120MM Mortar System. The ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. The obturating ring ensures equal muzzle velocities in hot or cold barrels by keeping all the gases in the barrel until the cartridge has fired. These fuzes use a clockwork mechanism to delay functioning for a specific time. The fuze setter, M25, sets M84-series time fuzes. M252 81mm Mortars The M252 81mm medium extended range mortar (see diagram below) is a crew-served, smooth bore, muzzle loaded, high angle of fire weapon system. c. Mechanical Time. A lock ( Those cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. This section implements STANAG 2321 and QSTAG 900 (Edition 1). A safety latch located at the side of the recess is used to secure the ball. Attached to the right of the screw is the traversing handwheel. Standard A ammunition for the M29A1 mortar is Standard B for the M252 mortar (, Light green Yellow band with red markings. The gunner is given a deflection change in a fire command between 20 and 60 mils inclusive. The propelling charges are assembled around the fin assembly shaft. If the round does not fire, the gunner tests the barrel for heat. See Chapter 3, paragraph 3-14 for a detailed discussion of malfunctions. (3) Markings on rounds. Disposal Precautions. Excess increments should not accumulate near the mortar positions but are removed to a designated place of burning and destroyed. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. c. The first ammunition bearer checks the barrel and ensures that--. The 81mm mortar is a portable, mobile, medium mortar at the infantry's disposal. The cartridge is painted olive drab with yellow markings. The gunner removes the sight and places it in the case with 3200 deflection and 0800 elevation indexed. The fuze has a safety wire that must be removed before firing. The M734 multioption fuze is the only one used with the 81-mm mortar. (e) If the mask is not regular throughout the sector of fire, the gunner determines the minimum mask clearance as described above. When the baseplate is in position, the first ammunition bearer lowers the breech plug into the rotating socket and rotates the barrel a quarter of a turn to lock it. It uses the M185 propelling charge that consists of eight increments fitted into the spaces between the fins and held by a propellant holder. The fuze body is graduated from 0 to 50 seconds in 2-second intervals; 10-second intervals are indicated by bosses. The company level vehicles also carry a vehicle-mounted 120mm mortar, which is augmented by the 60mm M224 mortar for dismounted use. If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. It was even a tool used by airborne units, and was dropped in parachute bundles during Operations Neptune, Market Garden, and Varsity.

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