A compact version of the M-16, the M4 is commonly used when the firepower of an assault rifle is needed, but the weight and size is not. It is commonly used by US and Israeli special forces. It comes standard with a single and three round burst trigger group, but the A1 variant comes with a single and full-auto trigger group. It can be silenced with the M4-96D suppressor module. It is used by SOF with a 4x Trijicon ACOG(Advanced Combat Optical Gunshight) or with an Aimpoint Comp-M or M68 reflex sight in the CQB role.

Other options include various laser types, thermal and other night vision aids inlcuding a tactical light, and a forward handle to aid in full-auto firing(adds more controlability to the recoil of full-auto fire)and quicker handing.