Our custom M4 Airsoft upgrade compression kit using a combination of SHS and ZCI components. These parts offer a great compression seal whilst excellent value for money.
Provides the following upgrades:
- SHS aluminium nozzle with single o-ring (21.4mm)
- SHS aluminium cylinder head with padded bottom and double o-rings
- ZCI Stainless steel cylinder (72mm length, 23.7 inner diameter, 25.5 outer diameter)
- SHS 6 vent aluminium piston head
- SHS 14 steel tooth piston (Blue)
Cylinder Size Guide
