Bore-Up Cylinder For MP5K/PDW

Bore-Up Cylinder Type 4 for MP5K/PDW
Stainless 304 material / 5 types
Ribbed surface finish increases cylinder-surface-to-air area to thus increase heat dissipation.
Fine inner surface finish enhances piston reciprocation.

With large cavity to produce more air. Stainless steel construction with thin walls and smooth inside finish.