M16A2 / M16A3 / M16A4 20 inch Steel Outer Heavy Barrel｜M16A2 / M16A3 / M16A4 20 吋鋼製重管外管

One Piece Steel CNC Processing, Except Flash Hider Thread.
Including 1 Flash Hider Thread Adaptor (1/2-28 TPI Colloquial Called +12 mm In Airsoft).

鋼製ㄧ體成型 CNC 全切削，防火帽螺牙除外。
內含防火帽螺牙轉接座 (1/2 英寸螺牙 玩具槍通稱 正 12 mm 牙) ㄧ顆。