CMMG 45CA917 Receiver Extension & Stock Kit 5 Position RipStock Black Synthetic for AR-15

The CMMG RipStock is a revolutionary, retractable buttstock engineered for lightning-fast deployment. It features CMMG's Fastback technology, which allows you to simply pull straight back to extend the stock. Its P3 Technology (Personal Position Preset) allows you to adjust the indexing screw and to set your own preset. The package includes a CMMG RipStock with a RipStock Adjustable Position Tube, P3 indexing screw, spring and buffer, ambidextrous sling plate, and a castle nut.