M240 Flashcards
(36 cards)
M240 General Characteristics
Air-cooled, belt-fed, gas-operated, automatic weapon. it fires from the OPEN-BOLT POSITION
M240 Weight
27 LBS
M240 Maximum Range
3,725 Meters
Max Effective Range
Point Target
Tripod - 800 Meters
Bipod - 600 Meters
Max Effective Range
Area Target
Tripod - 1,800 Meters
800 Meters
Muzzle Velocity
2,800 fps
M240 Barrel Characteristics
1/12 right-hand twist
All M240 barrels have an established head space, 2-7 clicks
M240 Sights
- Rear, fully adjustable peep-type sight for elevation and windage
- Front Post Sight
M240 Battle Sight Zero
12.7 Meters for 500 Meter Zero
M240 Cyclic Rate
600-950 round per minute (regulator and buffer dependent)
M240 Weapon Employment
May be used effectively against; Personnel, Light Armored Vehicles, Small waterborne Craft, Aircraft,
M240 Operators Manual
SW360-AH-OPI-010
General Information,
M240 Tech Manual
SW360-AH-OMP-010
Everything in Operator Manual (More Detailed)
M240 Mount Manual
SW360-AQ-MMO-010
All Weapon Log Book
SW360-AA-MMO-010
Firing record for guns and barrels
NEED (x3) Books for the M240
Marine Corps War-fighting Publication
MCWP 3-15.1
Machine Guns and Machine Gun Gunnery;
M249, M240, M2HB, and MK19,
CSW Employment and Gunnery
Clearing Live Ammunition From Guns Manual
SW300-BC-SAF-010, Rev 2
Force Protection Weapons Handling Standard Procedures and Guidelines Manual
NRTP 3-07.2.2
M240 Five Major Assemblies;
- ) Bolt and Operation Rod Assembly,
- ) Barrel Assembly,
- ) Buttstock and buffer Assembly,
- ) Receiver Assembly,
- ) Trigger Housing Assembly,
M240, What are the three Gas Regulator Settings for;
- ) For Normal Operation,
- ) Used for Firing Blanks,
- ) Use when experiencing Sluggish Operation due to Environmental Conditions.
M240, CHAMBERING Cycle of Operation
When the trigger is pulled, the sear is lowered releasing the bolt and operating rod assembly. As the driving spring rod assembly pushes the operating rod forward the bolt feed horn strikes the base of the round in feed tray groove and strips the round from the belt link. The pressure of the cartridge guides holds the round so that positive contact is made with the top of the bolt. The front cartridge guide also prevents forward movement of the link as the round is stripped from the belt. The chambering ramp angles the round downward and into the chamber. When the round is fully seated in the chamber, the extractor snaps over the rim of the cartridge, and the ejector is compressed.
M240, LOCKING Cycle of Operation
As the round is being chambered, the bolt and operating rod assembly continue forward. The receiver locking cams force the bolt locking lever down. The operating rod continues to move forward, causing the locking lever link to rotate downward and back. This forces the locking lever arms down to their fullest extent in front of the bolt locking rails. Locking is now complete.
M240, FIRING Cycle of Operation
The round is now fully seated with the breech locked. The final forward movement of the operating rod drives the firing pin through the bolt assembly onto the cartridge primer and fires the round. The working parts are now fully forward.
M240, UNLOCKING Cycle of Operation
After the round is fired and the projectile passes the gas port, some of the expanding gases pass through the gas port through the gas regulator into the gas cylinder. The rapidly expanding gases enter the hollow end cup of the gas piston and force the operating rod assembly to the rear. At this point, the locking lever link begins to swing toward the rear, lifting locking levers over bolt locking rails carrying the bolt with it into its unlocked position, and clearing the barrel breech.