Bore-Up Cylinder Set for TM AUG

The Bore-Up Cylinder Set needs with M120~M170 Spring.

Include: 
Stainless Bore-Up Cylinder Head
Bore-Up Air Seal Nozzle
Bore-Up Ventilation Piston Head
Bore-Up Chro

Material: S303 Stainless Steel/Brass/Polycarbonate/Acetalmium Plating Cylinder