The B.R.E. The Samson Bufferless Receiver Extension features a picatinny folding stock adapter. This extension is a versatile 6-position adjustable carbine buffer tube that is expertly engineered to merge flawlessly with mil-spec AR-15 carbine stocks. The folding mechanism is detachable and can be conveniently reinstalled for right side folding. The extension is compatible with Brownell\'s BRN-180, Sig Sauer MCX, Sig Sauer MPX, and other bufferless setups, making it a practical choice for a variety of firearms. Please note, the stock is not included in the package.