(10) Drive spring rod assembly.

(11) Bolt/operating rod assembly.

(12) Cover assembly.

(14) Tripod assembly (not shown).

(15) Ejection port.

Provides energy for returning bolt and operating rod assembly to firing position.

Provides feeding stripping, chambering, firing, extracting, and ejecting of cartridges using propellant gases for power.

Feeds linked belt, positions and holds cartridges in position for stripping, feeding, and chambering. Top rail configuration allows mounting of optical and electronic sights.

Serves as guide for positioning cartridge to assist in chambering. Has a slotted top to allow air to circulate around barrel for cooling purposes.

The tripod T&E mount assembly is flexible, provides a stable mount, absorbs recoil, and improves accuracy.

Provides guide for ejection of spent cartridges.

Table 3-2. Components and purposes (continued).

M240b Tables
Figure 3-2. Major components of the M240B.

a. Sights. The front sight is attached to the barrel and can be adjusted for elevation and windage to allow the gunner to zero his weapon. Since the sight on the barrel is adjusted to zero the machine gun, both barrels must be zeroed before combat and training. The rear sight is attached to the rear of the receiver and is marked for each 100 meters of range, from 200 to 800 meters on the upper surface of the leaf, and on the reverse side of the leaf from 800 to 1,800 meters. (Figure 3-1)

b. Safety Mechanism. The safety mechanism is located on the pistol grip just behind the trigger well. When the safety is pushed to the right, the letter "S" is visible indicating the weapon is on safe. When pushed to the left, the letter "F" is visible on the safety indicating the weapon is on fire. The safety can only be engaged when the bolt is in the rear position. On the "S" position, the bolt cannot be released to go forward (Figure 3-1).


The M240B machine guns use several different types of 7.62-mm standard military ammunition. The specific type ammunition and its characteristics are as shown in (Figure 3-3). Soldiers use only authorized ammunition that is manufactured to US and NATO specifications. The ammunition is issued in a disintegrating, metallic, split-linked belt (Figure 3-4).

Crew Served Machine Guns
Figure 3-3. 7.62-mm cartridges for the M240B machine gun.
Figure 3-4. 7.62-mm cartridge in metallic belt.

a. Classification. The M240B machine guns ammunition are classified as follows:

(1) Cartridge, 7.62-mm BallM80—for use against light materials and personnel, and for range training.

(2) Cartridge, 7.62-mm Armor-Piercing M61—for use against lightly armored targets.

(3) Cartridge, 7.62-mm Tracer M62—for observation of fire, incendiary effects, signaling, and for training. When tracer rounds are fired, they are mixed with ball ammunition in a ratio of four ball rounds to one tracer round.

(4) Cartridge, 7.62-mm Dummy M63—for use during mechanical training.

(5) Cartridge, 7.62-mm BlankM82—for use during training when simulated live fire is desired. A BFA should be used to fire this ammunition.

b. Storage. Ammunition is stored under cover. If ammunition is in the open, it must be kept at least 6 inches above the ground and covered with a double thickness of tarpaulin. The cover must be placed so that it protects the ammunition yet allows ventilation. Trenches are dug to divert water from flowing under the ammunition.

c. Care, Handling, and Preservation. Ammunition should not be removed from the airtight containers until ready for use. Ammunition removed from the airtight containers, particularly in damp climates, may corrode.

(1) Ammunition must be protected from mud, dirt, and moisture. If it gets wet or dirty, the ammunition must be wiped off before using. Lightly corroded cartridges are wiped off as soon as the corrosion is discovered. Heavily corroded, dented, or loose projectiles should not be fired.

(2) Ammunition must be protected from the direct rays of the sun. Excessive pressure from the heat may cause premature detonation.

(3) Oil should never be used on ammunition. Oil collects dust and other abrasives that may possibly damage the operating parts of the weapon.

d. Packaging. The ammunition box contains two cartons. Each carton has a bandoleer for carrying purposes. Each carton contains 100 rounds and weighs about 7 pounds. Ammunition in the bandoleers may be linked together, attached to the hanger assembly, and fired from the container or the bandoleers may be removed for firing.


The ammunition adapter is used on the M240B machine gun when firing. This adapter allows the gunner to use the 100-round carton and bandoleer. (Figure 3-5)

a. Attaching the Ammunition Adapter. The ammunition adapter is fitted to the left side and under the feed tray of the receiver. When looking at the left side of the receiver, you will see a slot and a button under the feed tray (Figure 3-5). The gunner first attaches

Figure 3-5. Ammunition adapter.

the bandoleer holder to the base of the adapter by inserting the tapered end (green plastic) of the holder into the adapter. Then the gunner opens the cover assembly, and raises the feed tray. He inserts the curved lip of the adapter assembly into the slot located in the rail on the left of the receiver, below the feed tray, depressing the lever on the adapter assembly, and pushing the assembly towards the receiver, until it is against the receiver. Releasing the lever to allow the adapter assembly to secure itself onto the button on the receiver (Figure 3-5).

b. Care of the Ammunition Adapter. Over a prolonged period, the moving parts, to include plastic, will start to wear out and break.

(1) Inspect the adapter for damaged parts, excessive wear, and cleanliness when every the weapon is taken out of the arms room.

(2) When feasible, test-fit the adapter.

(3) After using the adapter, inspect to ensure it is still operational. 3-5. BLANK FIRING ATTACHMENT

The BFA is used on the M240B machine gun when blank cartridges are fired to simulate live firing during training where live firing is not practical (Figure 3-6).

Figure 3-6. Blank firing attachment.

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