5.56 cal., same length as the receiver and has the #40™ rear flip-up sight built in.
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| The Swan Sleeve provides a platform that is semi-permanent to the 5.56 M16 type weapons equipped with a flat-top receiver. The Swan Sleeve is designed for optimum optic accuracy and alignment. This model incorporates the A.R.M.S. #38 series rear sight. |
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