h. Where the ground is uneven and there is no level surface for the bipod, the gunner can adjust the plain leg. The adjustment ring has six raised ribs for use in conjunction with fuze setter, M25, and a setting indicator rib (marked SET) about half the height and width of the other six ribs. The adjustment ring has six raised ribs for use in conjunction with fuze setter, M25, and a setting indicator rib (marked SET) about half the height and width of the other six ribs. c. The moisture-resistant seal of the container is broken when the ammunition is to be used. e. The M362A1 and M362 HE cartridges are of steel forge construction and contain about 2.10 pounds of composition B explosive. The gunner places the announced deflection on the sight (without disturbing the lay of the weapon) and looks through the sightunit. M29, 81mm Mortar - Military Factory A .mil website belongs to an official government organization in the United States. The section leader, acting as FDC, has one deflection instead of two or more. e. Dummy. Developed by Hirtenberger Defence Systems (HDS), the rugged and reliable M8 comprises an 81 mm long-range weapon available in different barrel lengths, an entire range of ammunition, auxiliary field equipment, sighting systems and a fully digital fire-control system containing all ballistic data. FIRING TABLE FOR 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; AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B; AND CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5 AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 FIRING PROJECTILE, GUIDED, M712 (COPPERHEAD) WITH SHAPED TRAJECTORIES (S&I BY PROP SEE DETAILS, FOOTNOTES), PROVISIONAL AIMING DATA FOR CANNON, 155MM, HOWITZER, M185 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1B HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A2 AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A4 AND CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5 AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1 FIRING PROJECTILE, BASE-BURN, M864 AND M864A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), PRELIMINARY AIMING DATA FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, XM982 (S&I BY PROP SEE DETAILS, FOOTNOTES), PROVISIONAL AIMING DATA FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, XM982 (S&I BY PROP SEE DETAILS, FOOTNOTES), PROVISIONAL AIMING DATA FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, M982 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 165-MM GUN, M135 ON COMBAT ENGINEER VEHICLE, FULL TRACKED, M728; FIRING CARTRIDGE, 165-MM, HEP, M123A1 AND 165-MM, TP-T, XM623 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 175-MM GUN, M113 AND M113A1 ON GUN, FIELD ARTILLERY, SELF-PROPELLED: 175-MM, M107; FIRING PROJECTILE, HE, M437A2 AND M437A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), RAPID FIRE TABLES FOR CALCULATION OF THE EXECUTIVE OFFICERS (XOS) MINIMUM QUADRANT ELEVATION WITH CANNON, 105MM HOWITZER, M20A1 ON HOWITZER, LIGHT, TOWED, 105MM, M119A1; HOWITZER, LIGHT, TOWED, 105MM, M119A2; HOWITZER, LIGHT, TOWED, 105MM, M119A3 FIRING WITH PROPELLING CHARGES, M67 AND M200 (S&I BY PROP SEE DETAILS, FOOTNOTES), RAPID FIRE TABLES FOR CALCULATION OF THE EXECUTIVE OFFICER S (XO S) MINIMUM QUADRANT ELEVATION WITH CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5/A6 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1/A2 FIRING WITH PROPELLING CHARGES, M231, M232, AND M232A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), RAPID FIRE TABLES FOR CALCULATION OF THE EXECUTIVE OFFICERS (XOS) MINIMUM QUADRANT ELEVATION WITH CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5; HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6; AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A7, AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1 AND HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING WITH PROPELLING CHARGES, M231, M232, AND M232A1 (S&I BY PROPONENT, SEE DETAILS, FOOTNOTES), ADDENDUM TO FTR LANCE-B-1 FOR WARHEAD SECTION, GUIDED MISSILE, HE: M251 (U) (S&I BY PROP SEE DETAILS, FOOTNOTES), Search Army publications and forms by Number, Title, or Record Detail. The Marines' Trusty Mortar Is Getting a Major Upgrade - Popular Mechanics The cartridges are painted olive drab with yellow markings. c. The assistant gunner disengages the barrel clamps and moves the bipod from the immediate area of the mortar position. a. Point-Detonating. One-quarter turn on the adjusting nut equals one turn of the traversing handwheel. When fired, the cartridge carries the ignition cartridge with it, leaving the mortar ready for the next cartridge. He places firing data on the sight and lays the mortar for deflection and elevation. It is set using the bladed end of the M18 fuze wrench. At extreme temperatures (below -40 degrees Fahrenheit and above 125 degrees Fahrenheit), it is not unusual to experience an increase in malfunctions proportionate to the severity of conditions. In charge was the platoon commander - normally a lieutenant. The components of the mortar consist of a cannon, mount, and baseplate. The RSTA squadron only receives the 120mm mounted mortar, there is no augmentation dismounted maneuvers. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. Safety before firing is provided by a safety wire, which must be removed just before firing. He uses the chain of command to assist him in effecting his command and supervising duties. c. The first ammunition bearer checks the barrel and ensures that--. That is generally how I use mortars. b. The propellant train (except the training cartridge) consists of an ignition cartridge and propellant charges. The fuze has a safety wire that must be removed before firing. If not, he may still fire at the desired range by selecting a charge zone having a higher elevation. Target terrain, such as ice and dry sand, gives lowest burst heights, whereas water and wet ground give highest burst heights. Safety before firing is provided by a safety wire, which must be removed just before firing. d. The gunner recovers the baseplate to the area designated by the squad leader. The gunner removes the sight and places it in the case with 3200 deflection and 0800 elevation indexed. a. Figure 4-7. The gunner places the outer edge of the baseplate against the baseplate stake so that the left edge of the cutaway portion of the baseplate is aligned with the right edge of the stake (Figure 4-7). The vertical cross line of the sight is on the left edge of the aiming point. A securing strap is attached to the plain leg for securing the bipod in the folded position. The muzzle end has a short tapered lead-in which acts as a . This is the inert PD fuze type "IR-81" used by the Italians for their 81mm mortar rounds during WWII. After the 30-minute waiting period, the dud is still dangerous but can be approached and removed carefully or destroyed in place by qualified disposal personnel. 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. FM 23-90 Chptr 4 81-mm Mortar, M252 - GlobalSecurity.org The removable increments are fitted onto or around the shaft, depending on their type. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self propelled M125A1 and M125 Carrier, 81mm Mortar Tracked XM755 The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. High explosive is used for both fragmentation and blast effect against personnel and light-skinned vehicles. Fired . He rotates the socket so that the open end is pointing in the direction of fire. After the mortar is mounted, the gunner makes a thorough check. The propelling charge is contained in four horseshoe-shaped, felt-fiber containers or nine wax-tested, cotton cloth, bag increments. He has the duty of preparing the ammunition and passing it to the assistant gunner. The cartridge is painted light green with black markings and one narrow brown band. At the same time, the first ammunition bearer moves out on the double to realign the aiming posts. As a longstanding partner of armed forces around the globe, Rheinmetall supplies a wide array of mortar systems and ammunition. a. The M853 cartridge (M252 only) has a cylindrical body that contains an illuminating candle and parachute assembly. d. The M374A2, M374A1, and M374 HE cartridges are painted olive drab with yellow markings and are constructed from pearlitic malleable cast iron. Its range and explosive power is greater than the M224, yet it is still light enough to be man . They function normally in light rain; however, heavy rain, sleet, or snow can cause an increase in the number of early bursts. b. c. Crest Clearance. (2) The barrel is locked to the baseplate, and the open end of the socket points in the direction of fire. 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. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the The cartridge is painted olive drab with yellow markings. 0.30, BROWNING, M1919A4, M1919A5 AND M1919A6 {TO 39A-5 AF-32} (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, MACHINE, CAL. In addition to supervising the emplacement, laying, and firing of the mortar, he supervises all other squad activities. Lock 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. The gunner stands to the left side of the mortar where he can manipulate the sight, elevating handwheel, and traversing handwheel. It contains white phosphorus that produces white smoke on contact with air. He maintains the ammunition for firing and provides local security for the mortar position. .50: BROWNING, M2 (HEAVY BARREL, TURRET TYPE) ON MOUNT, MACHINE GUN, TRAILER MTD: MULTIPLE CAL. b. The company level vehicles also carry a vehicle-mounted 120mm mortar, which is augmented by the 60mm M224 mortar for dismounted use. Designed by Thingsym. 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. (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. (3) The M84A1 fuze is a single-purpose, tungsten-ring, mechanical-time fuze used with the 81-mm M301A3 illumination cartridge. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. All mortar cartridges are painted to prevent rust and to identify their type. Standard A ammunition for the M29A1 mortar is Standard B for the M252 mortar (, Light green Yellow band with red markings. Mortar Weapon Systems - USAASC SQUAD AND SECTION ORGANIZATION AND DUTIES, Each member of the infantry mortar squad has principle duties and responsibilities. The fuze setter, M25, sets M84-series time fuzes. Weights (pounds) System (including basic issue items) Barrel (with blast attenuator device) Mount M3A1 Baseplate The entire squad stays with the mortar. 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. 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 . b. This round must be stored in a vertical position. The Mark 4 and 5 barrels were introduced during World War 2 and have a much increased range. The firing pin must be replaced and the bore swabbed. End this starting train with not less than 1 meter of inert material (dry grass, leaves, or newspapers). The M751 is fitted with a smoke charge that operates on impact. It can be fitted with either the M567, M524, or M532-series fuzes. 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 SMALL DEFLECTION AND ELEVATION CHANGES. Upon completion of any bipod movement on the barrel, the gunner ensures that the firing pin recess is facing upward. Prev - Mk6 Mortar range table for charge 0 Next - Mk6 Mortar range table for charge 2 . When the approximate alignment is completed, the gunner signals the assistant gunner to lower the bipod by pushing down on the mortar. MFCS Dismounted. Ammunition is typed according to use (Table 4-2). M821/M889 81mm HE Mortar Cartridges - GlobalSecurity.org (1) The M772A1 fuze is a MTSQ. Share sensitive information only on official, secure websites. The gunner unlocks the barrel clamp and rotates the barrel, unlocking the breech plug from the rotating socket of the baseplate. To convert the fuze from PROX to SQ/IMP, the top of the fuze must be rotated 120 degrees (one-third turn) in either direction. He may assist the gunner in shifting the mortar when the gunner is making large deflection changes. The M853 and M301A3 illuminating ammunition are described herein. The M252 system . LARGE DEFLECTION AND ELEVATION CHANGES. Barrel (with blast attenuator device) The barrel clamps are then closed. The fuzes may be used for day or night operations. The mortar is within two turns of center of traverse. . Tabulated data. 81-mm MORTAR, M252 The 81-mm mortar, M252, delivers timely, accurate fires to meet the . The ignition cartridge has a percussion primer and is assembled to the end of the fin assembly. b. All PD fuzes are superquick--detonate on impact. After the rounds have been removed, they should always be handled with two hands to prevent accidental dropping. (3) The securing strap is correctly located, securing the barrel clamps and buffers to the plain leg. The striker has been modified to be able to use German and Italian patterns of 81mm mortar . d. The gunner removes the sight from its case, mounts it on the mortar, and sets a deflection of 3200 mils and an elevation of 1100 mils. The components of the mortar consist of a cannon, mount, and baseplate. The first ammunition bearer shakes the barrel to dislodge any remnants from the last round fired, and he lowers the barrel into the rotating socket of the baseplate. (3) From this train, extend a starting train that will burn against the wind of single increments laid end to end. 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. The gunner is given a deflection and elevation change in a fire command causing the gunner to shift the mortar between 200 and 300 mils for deflection and between 100 and 200 for elevation. TM - Technical Manuals (Range 9) TM - Technical Manuals (Range 10) TM - Technical Manuals (Range 11-4) TM - Technical Manuals (Range 11-5) . Cartridges assembled with the M532 fuze must be fired above charge 0. Cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. The 81mm mortar rounds use Red Phosphorus as the smoke generating agent. Those cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. The first table is a chart that shows range and elevation for firing particular mortar shells. b. It is especially useful if the baseplate sinks deep into the ground during prolonged firing. However, since explosives are affected by moisture and high temperature, they must be protected. He places the sight case and aiming posts to the left front of the mortar position. The M252 medium mortar offers a compromise between the light and heavy mortars. To prepare for firing, the slot is aligned in the striker with SQ or delay using the M18 fuze wrench. The upper clamp is fitted with a locking arrangement that consists of a curved handle and a spring-loaded locking rod, which is ball-shaped at its lower end. The cartridge weighs about 9.12 pounds. (2) Burn all dead grass or brush within 30 meters around the burning place. d. When the barrel reaches the horizontal position, and not before, the assistant gunner moves the thumb of each hand over the muzzle. These fuzes use a clockwork mechanism to delay functioning for a specific time. The mortar is then re-laid on the aiming posts using the traversing crank. The gunner then kicks the barrel several times with his heel in an attempt to dislodge the round. A lock ( He levels all bubbles. He indicates the initial direction of fire by pointing in that direction and commands ACTION. When the gunner is satisfied with his sight picture he announces, "Up.". Mortar, 81mm M1 - Military Factory The M819 cartridge (M252 only) has a cylindrical body and contains red phosphorus that produces white smoke on contact with air. DESCRIPTION. (1) The rotating socket is free to move in a complete circle. Referring and realigning aiming posts ensure that all mortars are set on the same data. (d) Firing is slowed if mask clearance must be checked before each firing but this can be eliminated if minimum mask clearance is determined. c. The M375A2, M375A1, and M375 cartridges may also be used. With standard mortar, the maximum effective range is close to 4,000 metres; with a long-range system, this increases to nearly 4,500 metres. c. The elevating shaft is contained in the elevating leg; to the left of the elevating leg is the elevating handwheel. Increments removed from cartridges before firing should be placed in a metal or wooden container located outside the firing vehicle/position at least 25 meters away. The assistant gunner checks the bipod and ensures that--. It is assembled with the M772A1 MTSQ. The cartridges are returned to their original containers. c. Authorized Cartridges. 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. The round has a burst height of 600 meters and provides illumination for about 60 seconds for an area of about 1,200 meters. Light tree foliage and light vegetation affect the height of burst only slightly, but dense tree foliage and dense vegetation increase the height of burst. Fuzes are not disassembled. It arms within a maximum of 2.50 seconds. The ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. M252 mortar | Military Wiki | Fandom The ignition cartridge (with primer) is fitted into the base of the fin shaft. c. Mechanical Time. 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 60mm mortar section is located in the weapons platoon of the rifle company, is armed with three 60mm mortars, and is The gunner is given a deflection change between 5 and 25 mils, either increasing or decreasing from the last stated deflection, and the command to refer and realign aiming posts. He stands to the rear of the baseplate and supports the barrel until the bipod is fitted. Types of rounds, classification, and characteristics for the 81-mm mortar, M252. 81mm L16 | Weaponsystems.net a. He is also the squad driver. (5) Do not leave unused increments unburned in combat operational areas. c. After the gunner has announced, "Up," the squad leader should check the mortar to determine if the exercise was performed correctly. .30 BROWNING, M1917 AND M1917A1; GUN, MACHINE, CAL. REFER DEFLECTION TWO EIGHT SEVEN FIVE (2875), REALIGN AIMING POSTS. 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 fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. The 81mm mortar is a portable, mobile, medium mortar at the infantry's disposal. The leg-locking handwheel must then be tightened, ensuring the teeth are correctly meshed. This document (FT 81 B3, abridged) consists of two pages, each with a separate table. He must ensure that the ball-shaped end of the locking rod is secured in its recess by the locking latch. It has no safety pins or wires to reduce preparation time. An internal clock mechanism provides nine seconds of safe air travel (610 to 2,340 meters along trajectory for charge 0 through 9, respectively). Army Publishing Directorate In any case, the gunner must ensure that the cartridge does not strike an obstacle. It has a time setting of up to 25 seconds. Figure 4-4. d. Climatic Effects. When the fuze of the misfired round reaches the BAD, the assistant gunner stops the round with his thumbs (he does not touch the fuze) and carefully removes it from the barrel. The M821 HE cartridge (M252 only) is a British-made cartridge fitted with the US M734 multioption fuze. If the fuze does not function as set, it automatically functions at the next lower setting. 0.30, BROWNING, M1917A1; GUN, MACHINE: CAL. The barrel is then rotated a quarter turn to unlock it from the socket, and it is placed in an area designated by the squad leader. The mortar is mounted and the sight is installed. The M29 would become the standard American mortar in the upcoming Vietnam War. 81mm ML 3-inch | Weaponsystems.net The powder increments, mainly, should not be exposed to direct sunlight. This is accomplished by depressing the barrel until the top of the mask is clear. From introduction up to halfway World War 2 the ML 3-inch had a poor range of up to 1.45 km. c. Upon receiving the command REFER, REALIGN AIMING POST, two actions take place at the same time in the mortar squad. The squad leader indicates the direction of fire when mounting. e. The second ammunition bearer stands to the right rear of the mortar behind the ammunition bearer. It can be set from 3 to 55 seconds at half-second intervals. During training, the gunner may use the driving stake from the aiming post case. .50 MACHINE GUN, M3; FIRING CARTRIDGE, CAL. He must not stand directly behind the mortar. More uniform firing is obtained if ammunition is kept at the same temperature. (7) When opening an ammunition box, the ammunition bearer ensures the box is horizontal to the ground, not nose- or fin-end up. The M821A2/821A1/889A1 consists of the following major components: M935 Point Detonating Fuze or M734/734A1 Multi-Option Fuze. The aluminum tail assembly has six integral fins equally spaced around the rear, which stabilize the round in flight. This round may be stored in a horizontal position. They are painted light green with red markings and one narrow yellow band. If not, the cartridge is placed on its side, and the closing plug is removed using an M18 fuze wrench. a. At this command, the squad proceeds as follows: a. Fuze, PD, for 81mm mortar rounds, Italy, WWII, inert mortar, 81-mm: m29a1 and m29; firing cartridge, he, m374a2 and m374; cartridge, wp, m375a2 and m375 (s&i by prop see details, footnotes) ardec: ft 81-al-4(abr) active: 12/24/1970: firing tables for mortar, 81mm, m29 and m1 firing cartridge, illuminating, m301a3 with fuze, time, m84a1, height of burst, 600 meters (s&i by prop see details . At the muzzle end is a cone-shaped blast attenuator device (BAD) that is fitted to reduce noise. a. These are NDI items . (2) The M524-series fuze has two function settings: superquick/impact (SQ/IMP) and delay. The safety pull wire is removed just before inserting the cartridge into the mortar. Training practice--M879, M880, M68, and sabot. Types of rounds, classification, and characteristics for the 81-mm mortar, M29A1 (Standard B for the 81-mm mortar, M252). 81 mm mortar - Wikipedia These cartridges are used first in subsequent firing so that once-opened stocks can be kept to a minimum. Training practice is used only for training. Baseplate placed against baseplate stake. The first ammunition bearer puts both hands on the cooling fins under the barrel and slowly lifts the barrel until it is horizontal. The cartridge is dropped down the barrel, fin-end first. M252 81mm Medium Extended Range Mortar - Specifications M120/M121 120 mm Mortar. a. He tightens the leg-locking handwheel (ensuring the teeth are correctly meshed) and fastens the securing strap over the arm and around the buffers.
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