KNS Precision AR-15 Stock Adapter with Flange Features The KNS Precision Stock Adapter with Flange is machined from aluminum and finished in a durable matte black built to replace a standard AR buffer tube with a Picatinny rail section for mounting folding stocks and braces. The kit is composed of two parts an externally threaded adapter plug that fits into the buffer socket or ring and a rail section that slides into the plug and locks in place with a hex socket bolt and lock washer. Because this flange equipped version incorporates the standard AR-15 takedown pin detent and spring interface it suits lower receivers that still rely on those components even though they do not use a functioning buffer and buffer spring. This setup gives shooters running MCX style or non-reciprocating buffer tube guns access to the large aftermarket of AR-pattern folding stocks. Swapping to this adapter allows the use of folding stocks such as the SIG MPX style folding stock or brace shortening the overall length of the firearm for storage or transport. The adapter is intended only for applications where the carrier and buffer tube do not protrude past the receiver ring and it will not function on a standard configuration AR-15 that requires a buffer and buffer spring to cycle. Installation is straightforward with the plug threading into the receiver and the rail section bolting to the plug for a secure repeatable mount. For builders working with buffer-less systems that still need the takedown pin and detent functioning the KNS Precision Stock Adapter with Flange is a purpose-built solution. KNS Precision AR-15 Stock Adapter with Flange Specifications Manufacturer: KNS Precision Model: Stock Adapter with Flange Compatible Hosts: AR-15 MCX Color: Black Finish: Matte Material: Aluminum Available At: GrabAGun