Warning

Make sure the gun is clear of ammunition before starting. (1) Check headspace first as previously described. (2) Pull the bolt to the rear with the retracting slide handle and then ease bolt fully forward to cock the machine gun. (3) Grasp the retracting slide handle and retract the bolt just enough (1 16 inch) to insert the no-fire gauge between the barrel extension and the trunnion block. Release the retracting slide handle (Figure 3-23). (4) Depress the trigger. Gun should not fire. Figure...

Accessories For Ground Mounts

The following paragraph explains the functions of the traversing and elevating mechanism and pintle used in the mounting of the machine gun when used in the ground configuration. a. Traversing and Elevating Mechanism. The T& E mechanism (Figure 1-8) is used to engage preselected target areas at night or during limited visibility conditions. Record direction and elevation readings from the traversing bar and T& E mechanism. Record all readings in mils. (1) The traversing mechanism consists...

Tracking And Leading Exercises

The gunner normally completes instruction in firing at stationary targets before he receives instruction in firing at moving targets. The technique of engaging a moving target differs from that of engaging a stationary target. The gun must be aimed ahead of the moving target a sufficient distance to cause the bullet and target to arrive at the aiming point at the same time. The distance is measured in target lengths. One target length as seen by the gunner is one lead. Leads are measured from...

Maintenance Procedures

There are certain actions that must be taken before, during, and after firing to properly maintain the gun. See Table 2-2 for a preoperation checklist. DURING FIRING OR TEMPORARY CESSATION Oil lightly and test for worn or broken parts. They should function without excessive friction. Lubricate working parts. Observe the functioning of the gun to anticipate failures. Check adjustment by gauge and correct if necessary. Watch for bulged cases to prevent a ruptured (separated) case. If a PInail...

Train The Trainer Program

The information in this chapter tells how to train the trainer, how to advise the trainer, and how to assist the trainer in preparing the crew for the three phases of MG marksmanship. The Train The Trainer Program must be planned properly and conclude with a certification program. In the planning phase, the instructor teaches the trainer to be flexible and thorough. He must plan alternate exercises in case weather or other constraints prohibit the originally scheduled training. Training must...

Crew Exercises

The purpose of crew exercise is to develop precision, speed, skill, and teamwork in examining equipment, placing the gun into action, and taking it out of action. In crew exercise, precision must be stressed. Once that is attained, speed, skill, and teamwork will follow. Duties are rotated during crew exercise to allow each member of the gun crew to become familiar with all the duties. During crew exercise, all oral or visual signals are repeated. When the fire command is completed, the gunner...

Cycle Of Functioning

The cycle of functioning is broken down into basic steps feeding, cambering, locking, firing, unlocking, extracting, ejecting, and cocking. Some of these steps may occur at the same time. a. Feeding. Feeding is the act of placing a cartridge in the receiver, approximately in back of the barrel, ready for cambering. When the bolt is fully forward and the top is closed, the ammunition belt is held in the feedway by the belt-holding pawl (Figure 3-5)._ (1) As the bolt is moved to the rear, the...

Figure Aligning the lug on the barrel locking spring with the inch hole in the right sideplate

Ensure that the bolt latch release is up, free of the bolt latch release lock. If it is not, push down on the bolt latch release and turn the buffer tube sleeve to the right to free it (Figure 2-6). The bolt must be forward before the backplate is removed. If the bolt is to the rear, push down on the bolt latch release, place palm up on the retracting slide handle, and ease the bolt forward. The backplate latch lock and latch are below the buffer tube. Pull out on the lock...

Table Lead table

(1) The gunner must correct the lead as conditions change. If the target speed is 7 1 2 miles per hour, the amount of lead is half that shown in the table at 30 miles per hour, double that shown, The angle at which the target is moving also alters the amount of lead taken. If the angle between line of fire and line of travel of the target is less than 45 degrees, use half the lead shown in the table. (2) For targets moving directly toward the gun, the point of aim is placed on the center or the...

Figure Adjusted aiming point method of fire adjustment

Fire commands are technical instructions issued by a leader to enable the unit or crew to accomplish a desired fire mission. Fire commands have been standardized for infantry direct fire weapons, and they follow the same sequence. There are two types- initial fire commands, issued to engage a target and subsequent fire commands, which are issued to adjust fire, change the rate of fire, interrupt fire, shift fire to a new target, or to terminate the alert. A correct fire command is one that is...

Figure Ammunition for the M

The eight types of ammunition are used for the following purposes. (1) Ball. For use in marksmanship training, and against personnel and light material targets. (2) Tracer. To aid in observing fire. Secondary purposes are for incendiary effect and for signaling. (3) Armor-piercing. For use against armored aircraft and lightly armored vehicles, concrete shelters, and other bullet-resisting targets. (4) Incendiary. For incendiary effect, especially against aircraft. (5)...

Figure Removing the bolt stud

After freeing the bolt, slide it to the rear and out of receiver (Figure 2-11). Place the bolt down on its right side (with the extractor arm up), so that the extractor will not fall from the bolt. e. Bolt Group. After freeing the bolt, slide it to the rear and out of receiver (Figure 2-11). Place the bolt down on its right side (with the extractor arm up), so that the extractor will not fall from the bolt. Figure 2-11. Removing the bolt from the receiver. Figure 2-11. Removing...

Figure Feeding cartridge entering the Tslot in the bolt

Cambering is placing the cartridge into the chamber of the weapon. During this cycle, the bolt moves forward, carrying the cartridge in the T-slot in a direct route to the chamber of the weapon. At the same time, the extractor rides up the extractor cam and when the bolt is fully forward, the extractor grasps the next linked cartridge Figure 3-10. Cambering - new round aligned with the chamber. c. Locking. The bolt is locked to the barrel and barrel extension. (1) Initially, the...

Figure Desired impact point for the ANTVS

(a) Fire enough single-shot rounds to obtain a good shot group. Locate the center of the shot group. Adjust the AN TVS-5 azimuth and elevation knobs until the shot group impacts 9.8 centimeters below the target aiming point. Move the weapon so that the reticle aiming point is again on the target aiming point. Repeat this process until the desired point of impact is obtained. (b) When adjusting, move the azimuth or elevation adjustment actuator one click to move the strike of the round .5 inch...

Combat Techniques Of Fire

Technique of fire is the method of delivering and controlling fire Each member of the machine gun crew must be trained in standard methods of applying fire, either as a crewmember or a gunner, and must perform his assigned task automatically and effectively. The simplest and most effective technique of delivering fire with the machine gun mounted on its ground or vehicular mount is to align the sights of the gun on the target and fire this is called direct laying. At times, techniques of fire...

Table Ballistic data

Exercise care to prevent ammunition boxes from becoming broken or damaged. If they do, repair them immediately. Transfer all original markings to the new parts of the box. Do not open ammunition boxes until the ammunition is to be used. Ammunition removed from the airtight container, particularly in damp climates, is likely to corrode. Protect the ammunition from mud, sand, and water. If the ammunition gets wet or dirty, wipe it off at once with a clean, dry...

Dryfire Training

Dry-fire training is designed to teach the gunner the essentials of MG gunnery, including safety. Dry-fire training also includes sighting, aiming, sight setting, laying, manipulating the gun, manipulating the T& E mechanism, and determining the range. Thorough, carefully supervised training of these essentials is necessary to conserve time and ammunition during live fire. Practical exercises should be used to determine gunners' proficiency. Mastery of these skills is a must before the...

Figure Headspace and timing gauge

(2) Hold the bolt in this position and screw the barrel fully into the barrel extension (Figure 3-19). (2) Hold the bolt in this position and screw the barrel fully into the barrel extension (Figure 3-19). Figure 3-19. Screwing in the barrel. Figure 3-19. Screwing in the barrel.

Firing Positions

Sniper Prone Position

Before a gunner can hit targets, he must learn to get behind the weapon in a position that allows him to be comfortable, affords him protection, and enhances mission accomplishment. a. The tripod firing positions are prone, sitting, and standing. They are assumed in the following manner. 1 The prone position is used when firing from the tripod that is set in a low position. It is assumed by lying on the ground directly behind the gun. The gunner then spreads his legs a comfortable distance...

Loading Procedures

Trainers must ensure that the weapon functions correctly and that proper headspace and timing have been set before loading. When loading in either mode, the ammunition is fed into the MG in the same manner Figure 3-1 . Ensure that the bolt is forward and the cover is closed. Insert the double-loop end of the ammunition belt into the feedway until the first round is engaged by the belt-holding pawl. Figure 3-2 shows the correct procedures to use in the machine gun in the single-shot or automatic...

Range Determination

Range determination is the process of estimating the distance to a target from a gunner's position. The ability of the gunner to get the range to, sight on, and destroy a target is the realism of combat. Under combat conditions, ranges are seldom known in advance therefore the effectiveness of fire depends largely upon the accuracy and speed of the gunner in determining range. Some methods of determining range are estimating by eye Table 5-1, page 5-15 , firing the gun, measuring range from a...

Training Aids And Devices

Machine Operation Warning Light

The use of devices in marksmanship training programs are important factors because they may allow the gunner to get an idea of what actual combat is like. The training devices designed for the MG are the M19 blank firing attachment, the multiple integrated liner engagement system, the sighting bar, and the M3 recoil amplifier barrel used with plastic ammunition. The M19 BFA was developed to permit the MG to fire the M1A1 blank cartridge in the automatic fire mode. The BFA is an easy to install,...

Caution

Browning 50bmg

Care must be taken to prevent the bolt from slamming forward with the barrel removed. c. Driving Spring Rod Assembly. The inner and outer driving springs and driving spring rod are located inside the receiver next to the right sideplate Figure 2-8, page 2-6 . Push in on the head of the driving spring rod and push to the left to remove the driving spring rod retaining pin from its seat in the right sideplate. Pull the driving spring assembly to the rear and out of the receiver.

Figure Traversing and elevating mechanism

Browning Bmg Accessories

The gun is connected to the tripod mount, M3, by a pintle Figure 1-9, page 1-14 . This pintle is semipermanently attached to the machine gun by a pintle bolt through the front mounting hole in the receiver. The tapered stem of the pintle seats in the tripod head. It is held secure by a pintle lock and spring. To release the pintle, raise the pintle lock, releasing the cam. The weight of the pintle and traversing and elevating mechanism are considered as part of the total weight of...

Overhead Fire

Improvised Break Shotgun

Overhead fire is fire delivered over the heads of friendly troops. A machine gun on a tripod is capable of delivering this type of fire because of the small and uniform dispersion of the cone of fire. In the attack, the use of overhead fire permits the machine gun to support the advance of rifle units. Sectors of fire allow the trainers to plan safe training while still incorporating the combat realities of overhead fires. a. Minimum Clearance. The center of the cone of fire must clear the...

Table Maximum penetration for ball cartridge

Observe the general precautions concerning the firing and handling of ammunition in the field, as prescribed in TM 9-1300-206. Precautions that apply particularly to small-arms ammunition are 1 Do not fire small-arms ammunition other than blank ammunition until it has been positively identified by ammunition lot number and grade. Do not fire small-arms ammunition graded and marked For Training Use Only over the heads of troops. 2 Do not use armor-piercing cartridges in...

Figure Major groups

Turn the cover latch and raise the cover group Figure 2-3 . Grasp the retracting slide handle with the right hand, palm up, and pull the recoiling parts to the rear until the lug on the barrel locking spring aligns with the 3 8-inch hole in the right sideplate of the receiver just below the feedway exit . The barrel can be turned only when the lug is aligned with the 3 8-inch hole. Place the smallest loop of a caliber .50 link, or suitable spacer, between the trunnion block and...

Training Strategy

Training strategy is the overall concept for integrating resources into a program to train individual and collective skills needed to perform a unit's wartime mission. a. Training strategies for marksmanship are implemented in TRADOC institutions NCOES, basic and advanced officer's courses and in units. The overall training strategy is multifaceted and is inclusive of the specific strategies used in institution and unit programs. Also included are the supporting strategies that use resources...

General Assembly

Tdi Bmg Heavy Machine Gun

To assemble the gun, replace the groups and assemblies in reverse order of their removal in disassembly. a. Barrel Buffer Assembly and Barrel Buffer Body Group. Replace the barrel buffer assembly in the barrel buffer body group, with the key on the spring guide to the right. This key must fit in its slot in the right side of the barrel buffer body. Turn the barrel buffer tube until the screwdriver slot in the rear of the tube is vertical and the arrow is pointing to the right. The stud on the...

Ground Mounts

Ridge Machine Gun Tripod

The two principal ground mounts used with the caliber .50 machine gun are the tripod mount, M3, and the antiaircraft mount, M63. The tripod mount, M3, is a ground mount designed for use against ground targets. The antiaircraft mount, M63, is a ground mount principally designed for use against aerial targets. Its use against ground targets is limited because the mount tends to be unstable when the gun is fired at low angles. a. Tripod Mount, M3. The M3 mount is the standard ground mount of the...

Machine Gun Fundamental Skills Test

The machine gun fundamental skills test should be held periodically to ensure that proficiency with the MG is maintained by all crewmen. It consists of 10 fundamental skills all tasks are hands-on Figure 5-29 . The test should be given prior to range firing on a go no-go basis. 6. Set the headspace on the MG. 9. Perform immediate action on the MG. 10. Unload the MG.

Cleaning Inspection And Lubrication

Lubrication Checklist

To ensure proper care of the MG, it is necessary to have a system of maintenance or an SOP for the frequency of cleaning. Each gun should be cleaned as soon after firing as possible and each time it is exposed to field conditions. Under combat conditions, the gun should be cleaned and oiled daily. Under extreme climatic and combat conditions, it maybe necessary to clean and lubricate more frequently. Under ideal conditions, where the gun is not used, and is stored in a clean, dry place, it may...

Characteristics Of Fire

Trajectory Bmg Cal

The gunner's knowledge of his machine gun is not complete until he learns something of the action and effect of the projectiles when fired. This section discusses various characteristics of machine gun fire, including trajectory, cone of fire, and the beaten zone. a. Trajectory. The trajectory is the curved path of the projectile in its flight from the muzzle of the weapon to its impact. The major factors that influence the trajectory are the velocity of the round, gravity, rotation of the...

Headspace And Timing

Headspace is the distance between the face of the bolt and the base of the cartridge case, fully seated in the chamber. Timing is the adjustment of the gun so that firing takes place when the recoiling parts are in the correct position for firing. Because the cartridge is held by the T-slot of the bolt, headspace with the MG is measured as the distance between the rear of the barrel and the face of the bolt. This occurs when the recoiling parts are forward and there is positive contact between...

General Disassembly

The crew operating the MG must be fully familiar with its general disassembly, which consists of removing the major groups and assemblies for inspection and cleaning. The eight major groups that must be disassembled in the following order are barrel group, backplate group, driving spring rod assembly, bolt group, barrel extension group, barrel buffer body group, barrel buffer assembly, and receiver group Figure 2-2 .

Lefthand Feed

By repositioning some of the components, the MG is capable of alternate feed. Ammunition can be fed into the weapon from the right or left side of the receiver however the Army uses only left-hand feed. See Table 3-1 . By repositioning some of the components, the MG is capable of alternate feed. Ammunition can be fed into the weapon from the right or left side of the receiver however the Army uses only left-hand feed. See Table 3-1 . Belt-feed lever, shoulder headless pin, and spring. Upper...

Concept Of Zeroingtargeting

Pistol Front Sight With Scribe Marks

The concept of zero is very simple it is no more than the best way to adjust the sights of the weapon so the point of aim of the sights and the point of impact of the rounds are the same at any given range. A properly zeroed M2 gives the gunner the highest probability of hit for most combat targets with the least adjustment to the point of aim. There are three methods of zeroing targeting used with the .50 caliber MG. a. Ten-meter zero is the basic and the most common method of zeroing the M2...