ProMag Armorer's Upper & Lower Receiver Action Block Set AR-15

Product #: 310152 ProMag #: PM123A UPC #: 708279010156
Ships 04/20/2015 from MidwayUSA

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ProMag's AR-15 action blocks are constructed of impact resistant glass filled nylon that will not mar the finish of your receivers. The upper receiver blocks clamps around the receiver, fits flat-top and carry handle uppers. The lower receiver block fits into the magazine well, and is retained by the magazine catch.

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