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A.R.M.S. #50C Bi-Level S.I.R.® System
Civilian Version Bi-Level Slimline, for 5.56 cal. Carbine length M4's. Fits flat-top equipped weapons with carbine length gas systems. The #50™ is a slim line S.I.R. ® featuring a bi-level top dovetail Rail . The forward Rail section is lowered to allow co-witnessing of heads up display type optics when used in conjunction with our #40™ series rear sights and a standard height front sight post. This civilian version requires no modification to the weapon.
