The original M4 Carbine has semi-automatic and three-round bang incandescence modes, while the M4A1 disappointment "semi" and "full auto", with no three-round burst. The M4 Carbine achieves over 80% commonality with the M16A2 burgle and was intended to replace the .45 ACP M3 submachine ordnance and selected M9 pistols and M16 rob classification with most Army units. (This plan was hope to be changed with the development of the XM29 OICW and the XM8 carbine. However, both projects were cancelled.) The M4 Carbine is also accomplished of mounting the M203 grenade launcher.
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Like all the variants of the M16 assault rifle, the M4 Carbine and the M4A1 Carbine can be fitted with numerous accessories, such as night vision devices, laser pointers, telescopic sights, bipods, the M4 For Sale M203 munition launcher and the XM26 LSS shotgun, and anything else compatible with a MIL-STD-1913 Picatinny rail.