M4A1 SN - M4A1 with a Leupold-style sniper scope.M4A1 M - M4A1 with a Trijicon ACOG-style marksman scope.M4A1 RDS - M4A1 with an Aimpoint-style red dot sight.M4A1 CQB - M4A1 with an EOTech-style holographic sight (default for Grenadier class).M4A1 SUP - M4A1 with a flash/sound suppressor.M4A1 A - M4A1 with an M203 underbarrel grenade launcher.The M4A1, like the M16A4, features the full spectrum of available attachments in the game.
The M4A1 also features fully-automatic fire, instead of the three-round-burst mode on the M16 rifle, though both rifles feature a semi-automatic fire mode. The M4A1 boasts a shorter barrel than the M16, allowing for greater mobility for close-quarters combat, but sacrificing long-range accuracy. 223 Remington), the same round used in the M16 and M249, and similar to the PLA intermediate round, the 5.8mm x 42mm. The M4A1 uses the standard 5.56mm x 45mm NATO intermediate rifle round (known in non-military rifles as the. Later, the M4 was adapted to fully-automatic fire instead of burst fire with the M4A1, and the original, non-removable carrying-handle iron sights were replaced with a rail system, like the one present on the M16A4 rifle, which allows the iron sights to be removed to mount alternate optics in a simpler and more ergonomic configuration than the older M4 and M16 rifles. The M4 carbine rifle was originally developed by the United States Marine Corps as a shortened, three-round-burst variant of the M16A3 rifle.
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