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 inch wood screw swivel base is included, along with two super swivels with Tri-Lock.
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Magpul MAG529-BLK ASAP Sling Attachment Quick Detach AR-15/M4 Compatible w/ Mil-Spec & Commercial Buffer Tubes Black Steel Ambidextrous
$28.45
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