A.R.M.S. Extended Optical Sight Rail for AR-10
Optical Sight Rail (OSR) This item is designed for those people who want optimum optic accuracy without the need for a built-in rear combat iron sight, but need the other capabilities as found on the #38 Ex/S-Ex Military SWAN® Sleeve. This item can raise and lengthen your flat-top receiver while totally protecting the rifles factory dovetails. The #36's allow super low mounting for bench rest shooting while extending the standard receiver to better accommodate all lengths of optics.
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