军用步枪可以通过更换更好的零部件来获得更佳的性能，比如通过换装锻造机匣来得到更长的使用寿命，或是更换更强力的复进簧组件来提高射速。Two other modifications that were cut from the game, 上刺刀和reflex sight。
The service rifle can fire a total of about 1,995 standard rounds, the equivalent of 100 reloads, from full condition before breaking. When modified with the forged receiver, it can fire a total of about 2,995 standard rounds, the equivalent of 150 reloads, from full condition before breaking.
This rifle, along with two ammunition boxes can be found in a small, unmarked coyote den west of Primm (exact location would be further on west from the drive-in cinema and playground, just south of the Canyon Wreckage spot on the map) guarded by at least 2 coyotes.
Many rifles can be found on the corpses of NCR personnel and scattered on the ground on the remains of the Long 15 if it is targeted by the nuclear warheads that can be launched during The End.
The service rifle has a rear butt stock sling mount, but no forward sling mount, which would be attached to the front sight post.
This rifle noticeably has the same exact front sight as the one mounted on the assault carbine.
When experiencing a malfunction with the service rifle (or any other weapons which share its reload animation) the Courier will use proper procedure and utilize the forward assist to fully seat the bolt carrier group.
The service rifle is the standard infantry rifle of the NCR Army, being carried by the majority of troopers.
Behind the scenes
The service rifle is based on a cross between the AR-15 and the AR-10.
Sometimes in V.A.T.S., the service rifle will disappear from the player character's hands; the animation will continue, however, which will waste ammunition, and do no damage to the enemy. The gun will reappear when the V.A.T.S. animation ends. This glitch may happen outside V.A.T.S. as well, when crouching, but can be fixed by simply standing up. [已核实]
When completing the aid for Camp Guardian a loop can be created through dialogue with Private Halford to obtain 1 service rifle, 15 armor piercing 5.56mm rounds and 32 5.56mm rounds by going through the top dialogue options repeatedly. [已核实]
When upgraded with both the upgraded springs and the forged receiver, shooting with surplus ammunition makes the Condition jump to 100% before it starts to decline. The condition drops to a certain point around the 75% mark on the scale and then jumps to 100% Condition making 5.56mm surplus ammunition much more valuable as a repair exploit. The process is repeatable. [已核实]
A service rifle model with the forged receiver modification
A service rifle model with the reflex sight modification
A service rifle model with the bayonet modification
A service rifle model with all the modifications, including cut content