As issued to US troops for the M4 and M4A1 carbines. The M4 Carbine RAS converts AR-15, M4, M4A1 carbines with Mil-Spec M4 profile (.840″ diameter) barrels into the MWS (Modular Weapon System) configurations. Installs without special gunsmithing tools. Includes a quantity of 3 black KAC 11 Rib panels. P/N: 98064
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