Command Arms CAA Two Piece Free Float Quad Rail System XM4SD Piston Compatible Carbine
XM4SD - Carbine Aluminum Quad Rail requires delta ring removal and clamps to barrel nut. ADAMS ARMS PISTON COMPATIBLE!
Designed to exceed the newest requirements of the US Army for improving zero retention/repeatability. With a new slimmer profile, CAA’s newest Picatinny quad rail improves durability, reliability and maintainability while interfacing with all issued weapon system components.