The OPS-416 is designed to function flawlessly on quality mil-spec guns (Bushmaster, Colt, Rock River, DPMS, Stag Arms, FN, Smith & Wesson, Olympic, Armalite, Saber Defense, etc.) in either full auto or semi auto with standard profile barrels measuring no greater than 1.00" outer diameter or less, and measuring 11.5” to 20” in barrel length.
Fits Carbine Length AR15/M16/M4 Rifles With Barrel Diameter No Greater Than 1.00”
Fits Mid-Length Mid-Length Handguards AR15/M16/M4 Rifles And Barrel Diameter No Greater Than 1.00”
Fits Full Size 20” AR15/M16/M4 Rifles With Barrel Length of 20” And Barrel Diameter No Greater Than 1.00”