M240 Operation And Maintenance Flashcards
Chamber pressure for m240 series machine guns
52,940 psi
Muzzle velocity for m240b
2,750fps
Cycle of ops for m240
Feeding, chambering, locking, firing, unlocking, extracting, cocking
Definition of Maintenance function inspect
Inspect all assemblies for missing, broken, or loose parts. Inspect parts for cracks, dents, burrs, excessive wear, rust, or corrosion.
How often must al small arms be inspected and or engaged for active duty weapons?
At least annually for safety and servicability.
You inspect all assemblies for?
Missing, broken or loose parts
You inspect all parts for?
Cracks, dents, burrs, excessive wear, rust, corrosion
Make sure all parts are?
Cleaned and lubricated
Theory of operation that apply to all m240 series machine guns
Gas operated
Fires from open bolt position
Has positive locking of the bolt
__ and __ must must accompany the receiver when your m240 must be turned in to direct support maintenance
Both barrels and bolt assembly
Weight of m240b with barrel
27lbs 4oz
Weight of m240 with barrel
22lbs 3oz
Rapid rate
200rds/min 2-3sec in between bursts
Sustained rate
100rds/min 4-5sec in between bursts
Cyclic rate m240b
650rds/min
Cyclic rate m240
650-950rds/min
Theory of operation specific to m240b
Mounted on tripod(m122a1/m192)
Ground supported with integral bipod
Has front and rear sights
Optical accessory top cover and forward rail
Theory of operation specific to m240
Fires parallel to the turret main gun
No sights on machine gun
Fired manually or electronically
Fired manually from turret ring mount
8 major components of the m240 mg
Barrel assembly, buffer assembly, receiver assembly, trigger housing assembly, driving spring rod assembly, cover assembly, feed tray, Bolt and operating rod assembly
What should you always keep in mind during unit level pmcs
Warnings and cautions
____ provides energy for returning bolt and operating rod assembly to the firing position
Driving spring rod assembly
