SHS Bore-up cylinder set for M4

Currently out of stock across all retailers.

Essential part for upgrading your Airsoft Electric Gun AEG Durable cylinder with Polished Inner surface guarantee smooth action As always, upgrading AEG require necessary skill technique to dissemble the gearbox, consult expertise if needed Package Includes: 1. Stainless Bore-Up Cylinder Head 2. Bore-Up Air Seal Nozzle 3. Bore-Up Ventilation Piston Head 4. Bore-Up Chromium Plating Cylinder Bore-Up Cylinder Set need to be used with M120 ~ M170 AEG Spring (Recommended by Guarder)