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Designed for those who want optimum optic accuracy without the need of combat built-in iron sights, but need the other capabilities as found on the #38 S-Ex/ Ex Military SWAN®
Sleeve. Raise and lengthen your flat top receiver while totally protecting the rifle dovetails. Allows super low mounting for bench rest shooting that extends the standard receiver to handle all length optics. U.S.
Pat No 5,142,806
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