The B.R.E - The Samson Bufferless Receiver Extension with picatinny folding stock adapter is a 6-position adjustable carbine buffer tube designed to seamlessly integrate with mil-spec AR-15 carbine stocks. Attach to the Brownells BRN-180A(R), Sig Sauer MCX, Sig Sauer MPX and other buffer less set ups. FEATURES: Compatible with mil-spec AR-15 adjustable carbine stocks 6 position adjustable Folding Mechanism can be removed and reattached for right side fold Ramp to drastically improve ease of installing AR-15 stock Skeletonized to reduce weight, and.... because it looks cool Designed, Manufactured and Finished in Keene, New Hampshire, U Mfg: Samson Manufacturing Corp