Uncle Mikes magazine cap swivel set has a factory magazine cap with the swivel base already installed. Just unscrew the factory magazine cap and replace it with the new cap. For the buttstock, a 3/4″ wood screw swivel base is included, along with two super swivels with Tri-Lock.
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Rise Armament RA701308SLVR RA-701 Silver Stainless Steel with 5/8″-24 tpi Threads & 2.50″ OAL 1.35″ Diameter for 7.62x51mm NATO AR-Platform
$99.99
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