KNS Precision Compact AR/MCX Stock Adapter Black Compact AR-MCX Adapter. The Compact AR/MCX Stock Adapter allows the user to mount a picatinny-style stock attachment (such as the SIG MPX folding stock or SB Tactical FS1913 brace) in place of an AR15 style buffer tube. Many firearms utilize the buffer tube attachment of the AR15 in order to mount common stocks and braces but do not mechanically require the tube for an in-line buffer spring. For these weapons this product offers a modular alternative for attaching stocks or other accessories. The kit is composed of two parts and an attaching bolt. The externally-threaded adapter plug fits into the threaded buffer socket or ring. The adapter rail section fits into the slot in the adapter plug and the two are secured to each other and the firearm by a hex-socket bolt and lock washer. Specifications for KNS Precision Compact AR/MCX Stock Adapter: Manufacturer: KNS Precision Condition: New Color: Black Gun Make: AR Platform Additional Features: Stock Adapter Part Handle Color: Black Finish: Black Features of KNS Precision Compact AR/MCX Stock Adapter This product will not work with a standard AR 15 lower and the MCX upper Intended only for applications where the carrier and buffer tube do not protrude past the receiver ring Standard configuration AR15 style rifles will not function using this product 10/22 Charger Will Not Fit Package Contents: KNS Precision Compact AR/MCX Stock Adapter KNS Precision Compact AR-MCX Adapter: Compact AR/MCX Stock Adapter Black