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The S.I.R.(TM) System is designed to fit mil-spec flat top receivers from Colt, Armalite and Bushmaster in the 5.56 carbine lengths. There may be other flat top receivers
manufactured that the S.I.R.(TM) may fit to properly, but we do not guarantee or warrantee S.I.R.(TM) on any flat top receivers other than those listed above.
This modular receiver sleeving
system is a hand guard universal mounting system that leaves the barrel totally free-floating while providing a rigid ultra-light platform on which to mount virtually any mission specific accessory
like thermal imager, lasers, night vision, optical sight, M203, etc.
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