A.R.M.S.® #38™ Standard SWAN® Sleeve
5.56 cal., same length as the receiver and has the #40L™ rear flip-up sight built in.
The SWAN® Sleeve provides a platform that is semi-permanent to the 5.56 cal M16 type weapon equipped with a flat top receiver. It raises the rail by 1/2″ while protecting the rifle dovetail rail.
U.S. Patent No. 5,142,806 & 5,553,292.
THE SIGHT LEANS TO THE REAR SO AS TO FOLD IN THE CORRECT DIRECTION IF DROPPED, THUS MAINTAINING THEIR ZERO FOR ACCURACY AND GIVE LONGER TROUBLE FREE SERVICE LIFE!
100% MADE IN THE USA.