M4 carbine - Wikipedia, the free encyclopedia
1 History 1.1 Improved M4 1.1.1 Army upgrades 1.2 Replacement attempts 2 Design 2.1 Accessories 2.1.1 Feedramps 2.1.2 SOPMOD Block I 2.1.3 SOPMOD Block II 3 Variants 3.1 M4 MWS (Modular Weapon System) 3.2 M4A1 3.3 Mark 18 CQBR 3.4 Enhanced ......