Samson The B.R.E II Bufferless Receiver Extension Black. Attach to the Brownells BRN-180 Sig Sauer MCX Sig Sauer MPX and other buffer less set ups. Specifications for Samson B.R.E Bufferless Receiver Extension: Manufacturer: Samson Gun Type: Rifle Gun Make: AR Platform Gun Model: AR-15 Finish: MIL-A-8625 Hand: Ambidextrous Length: 6.36 in Weight: 10.2 oz Buffer Tube Size: Mil-Spec Condition: New Stock/Brace Material: 6061-T6 Aluminum Height: 1.44 in Overall Length: 7.25 in Fabric/Material: 6061-T6 Aluminum Width: 0.09 in Features of Samson B.R.E Bufferless Receiver Extension 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. Package Contents: Samson B.R.E Bufferless Receiver Extension What firearm models does the manufacturer say Samson B.R.E Bufferless Receiver Extension is compatible with? The manufacturer suggests that Samson B.R.E Bufferless Receiver Extension is compatible with AR-15Samson 04-06143-01: The B.R.E II Bufferless Receiver Extension Black