Heavy Machineguns Flashcards
What are the sights graduated on the M2?
100-2600 yards
0-62 mils
What is the weight of the M2?
Receiver - 60 lbs
Barrel - 24 lbs
Tripod - 44 lbs
* Total - 128 lbs
What are the rates of fire for the M2?
Sustained - < 40 rpm
Rapid - >= 40 rpm
Cyclic - 450 - 550 rpm
What is the muzzle velocity of the M2?
3050 fps
What are the ranges for the M2?
Maximum - 7400m
Maximum effective - 1830m
Grazing - 700m
What are the different types of ammo for the M2?
- M2 Dummy (Natural, holes in cartridge)
- M1, M1A1 Blank (Crimped)
- M2, M33 Ball (Natural)
- M1, M23 Incendiary (Blue tip)
- M1, M10, M17 Tracer (Red, orange, or brown tip)
- M2 Armor Piercing (Black)
- M8 Armor Piercing Incendiary (Aluminum tip)
- M20 Armor Piercing Incendiary Tracer (Aluminum tip with red ring)
- M903 Sabot Light Armor Penetrator (SLAP) (Amber tinted round)
- M962 Sabot Light Armor Penetrator (SLAP) Tracer (Red tinted round)
What are the major components of the M2?
- Barrel group
- Carrier assembly
- Backplate group
- Cover group
- Bolt group
- Receiver group
- Bolt stud
- Barrel extension group
- Barrel buffer body
- Driving spring rod assembly
Know the 4 conditions for the M2…
…
Condition 2 is known as (for the M2)?
Half Load
Condition 1 is known as (for the M2)?
Full Load
What are examples of common malfunctions for the M2?
- Failure to function freely
- Uncontrolled automatic fire
If using RBC to clean a weapon, you should use which three types of lubricants?
- Lubricating Oil Semfluid (LSA)
- Lubricating oil, special purpose (PL-S)
- Lubricating oil, general purpose (PL-M)
What is headspace?
The distance between the face of the bolt and the base of the cartridge case, fully seated in the chamber.
What is timing?
The adjustment of the gun so that the firing takes place when the recoiling parts are in the correct position for firing.
How far do the recoiling parts need to be out of battery to prevent contact between the front end of the barrel extension and trunnion block?
.020 and .116 inches
