Rail Systems

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.
  • 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.

Displaying products 1 - 11 of 11 results
ARMS #50-CV03 Convertible Top Rail for #50M-CV
Item Number: ARMS 50 CV03
Your Price: $94.78
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A.R.M.S. #51 C A1A2 S.I.R. System
Item Number: ARMS 51
Your Price: $402.21
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A.R.M.S. #56M-CV-C SPARTAN RAIL
Item Number:
Your Price: Starting at $267.05
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A.R.M.S. #56M-CV-EXT SPARTAN RAIL
Item Number: ARMS 56M-CV EXT
Your Price: $316.10
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A.R.M.S. #58 M-CV Mid-Length S.I.R. System
Item Number: ARMS 58M-CV
Your Price: $419.65
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A.R.M.S. #50 Bi-Level S.I.R. System
Item Number:
Your Price: $402.21
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A.R.M.S. #50M-CV S.I.R. System
Item Number: ARMS 50M-CV
Your Price: $323.73
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Tax Free
A.R.M.S. #58 Military Version for Mid-Length Gas System Weapons
Item Number: ARMS 58M
Your Price: $434.91
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A.R.M.S. #58M-CV MOD Mid-length S.I.R. System
Item Number: ARMS 58M-CV MOD
Your Price: $419.65
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A.R.M.S. #58 MOD for Mid-Length Gas System Weapons
Item Number: ARMS 58 M MOD
Your Price: $434.91
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A.R.M.S. #59 Full Length Rifle Bi-Level S.I.R.
Item Number:
Your Price: $458.89
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