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This 6063 aluminium outer barrel is made by precision CNC machines. It is specially made for professional shooter and competition needs because the outer barrel is modified for:
1) 2 securing screws are made for perfect installation;
2) ‘+M16’ (clockwise) thread at barrel tip;
3) An O-ring is installed inside the barrel tip for stabilizing the inner barrel;
4) It fits both the original (133mm) and longer inner barrel;
5) High precision barrel end ensures coaxial installation.