Metal cylinder head, M4 SHSUniversal cylinder head M4 from SHS. Primarily designed to weapons gearbox v. 2, but it is also in some other types. Precision metal cylinder head with two basic dimensions o-rings for a better tightness and lock in the cylinder. Abutment rubber silent resulting shocks and is adapted to the piston head with a flat face. Upgrade piece is made entirely from one piece of material on CNC machines with high accuracy.
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