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GAU-21
| Question | Answer |
|---|---|
| rate of fire | 950-1100 rds per min |
| the ___ is used to stop the bolt assembly at the end of its rearward movement and to absorb its remaining recoil energy | back plate assembly |
| the __ controls the feeding, extracting, and ejecting operations as well as the operation of the firing pin | bolt assembly |
| the __ forms the link between the barrel and the barrel buffer assembly | barrel extension assembly |
| the ___ supports, protects, and houses various assemblies | receiver assembly |
| __ is used to protect the barrel and minimize muzzle flash | barrel jacket and flash suppressor |
| the __ absorbs the recoil energy of the barrel assembly | barrel buffer assembly |
| the __ is used to feed the ammunition belt from either the left or right side of the receiver assembly | feed cover |
| the __ assists the rod assembly when pushing the bolt assembly into the battery position, ensuring there is also enough force to pull the ammunition belt correctly into the gun | auxiliary return springs |
| when the __ is actuated, the latch bolt releases the bolt assembly, thus beginning the cycle of operation | trigger assembly |
| Type of ammunition that has no makings | ball |
| Type of ammunition that the tip is painted black | armor-piercing |
| Type of ammunition that the tip is painted aluminum color | armor-piercing incendiary M8 |
| Type of ammunition that the tip is painted aluminum color or with light blue annulus to the rear | armor-piercing incendiary T49 |
| Type of ammunition that the tip is painted red with aluminum color annulus to the rear | armor-piercing incendiary-tracer |
| Type of ammunition that the tip is painted blue | incendiary M1 |
| Type of ammunition that the tip is painted blue with light blue annulus to the rear | incendiary M23 (T48) |
| Type of ammunition that the tip is painted red | tracer M1 |
| Type of ammunition that the tip is painted orange | tracer M10 |
| Type of ammunition that the tip is painted maroon | tracer M17 |
| Type of ammunition that has no bullet present | blank |
| Type of ammunition that has holes drilled in it with primer removed | dummy |
| minimum __ minutes of cooling is required after firing a total 300 rounds | 2 |
| __ minutes of cooling is after firing 600 rounds to provide complete cooling of the barrel | 10 |
| effective range | 1,850 meters |
| maximum range | 6,500 meters |
| a good rule of thumb for assigning a percentage for the ammo on a mission is to have __ percent for ingress, __ percent for the terminal area, and the other __ percent for egress | 25, 50, 25 |