T.A.C. converter Converts some airsoft and BB pistols to carbines* Folding grip and stock Removable forward grip Fixed front blade sight WIndage-adjustable rear sight Long Weaver/Picatinny rail on top 3 short Weaver/Picatinny rails (one of the rails is for the detachable forward grip) Overall length is 14 to 22.50 .97 lbs. Includes 4 adapters • *Fits HK USP (airsoft and BB gun), S&W MP40 BB gun, Umarex XBG BB gun, Combat Zone Enforcer airsoft gun and Walther P99 DAO airsoft gun.