Modify DMND Cylinder Type 0 for G3, M16-A1/VN, M16A2, AK

1. A diamond pattern wrapping around a cylinder design helps heat dissipation.
2. Special cut in the front makes the tappet move back more .
3. Increase the stroke to have good performance.

Suitable for inner barrel 450mm~580mm

G3, M16-A1/VN, M16A2, AK