Features and Specifications:Manufacturer Number: MCTAR-20G2Length: 7"100% made in the U.S.A. with Lifetime WarrantyComplete install in minutesRequires factory barrel nutRemoval of factory delta ring is requiredContinuous top railFour anti-rotation QD sockets for push button swivelsHigh quality 1913 mil-spec rails, T-marked for accessory locationIncredibly lightweight, extremely solid lock-upBillet machined from 6061 aluminum and hard coat anodizedPiston compatible. Works with most well known piston systems including STAG, CMMG, ADAMS, and Smith & Wesson to name a few (Will not work with Osprey System)Weight: 9 ouncesLength: 7.0 inchesWidth: 2.3 inchesHeight: 2.43 inchesBlackFits:AR-15