KNS Precision Compact AR-MCX Stock Adapter w/ Flange for AR Stocks

The KNS Precision Compact AR-MCX Adapter with Flange provides the advantages and versatility of AR/MCX adapters without the added rail length that locks into the rear AR15 receiver stock plate pocket.

Use this adapter 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.

This modular solution is ideal for firearms that utilize the buffer tube attachment to mount stocks or braces but do not require the tube for an inline buffer spring, offering a clean, compact way to attach stocks or other accessories while preserving overall weapon balance.

Kit contents: two parts and an attaching bolt—an externally-threaded adapter plug that fits into the threaded buffer socket or ring, and an adapter rail section that lockingly engages the plug and is secured with a hex-socket bolt and lock washer for a secure, low-profile attachment.

Designed for AR rifles where the carrier and buffer tube do not protrude past the receiver ring, helping preserve receiver geometry while enabling a compact way to attach stocks or other accessories.