The A.R.M.S.® Selective Integrated Rail System includes more unique and helpful features for the professional user than all other devices combined. Only the A.R.M.S. ® S.I.R. ® System allows you to have dovetail rails where you want them and not where someone else has decided for you. 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.
Features:
Free floating barrel design to achieve maximum accuracy potential.
Removable side and bottom dovetail rail panels for mounting accessories such as lights, lasers and vertical forward grips.
Drastically enhanced cooling.
Lightweight and rugged aluminum construction.
Quick Change Lower Handguard.
Available in both Civilian(C) and Military(M) configurations. (Installation of Military S.I.R. ® Variants requires removal of the Delta Ring/Handguard Retaining Ring).
The S.I.R. ® System is designed to fit mil-spec flat top receivers from Colt, Armalite, STAG, Rock River Arms, Barrett, CMT and Bushmaster in the 5.56 or 6.8 cal carbine, mid, and rifle lengths. The #51 S.I.R. ® Allows mounting to the carbine A1/A2 carry-handle. There may be other flat top receivers manufactured that the S.I.R. ® may fit to properly, but we do not guarantee or warranty the S.I.R. ® on any flat top receivers other than those listed above.