Lonex Enhanced Cylinder Set (M4-A1,M4-RIS,SR-16,M733) - Pom Vent Piston Head

FEATURES:
- GROOVED STEEL CYLINDERS FOR HEAT DISSIPATION
- STEEL BALLBEARING PISTON HEAD FOR SMOOTHER ROTATION OF SPRING DURING COMPRESSION
- VENTILATION HOLES IN PISTON HEAD GREATLY INCREASES SPEED THAT THE PISTON TRAVELS FOR FASTER CYCLING
- SIZE-MATCHED PISTON HEAD
- CNC PROCESSED POLYCARBONATE AIR NOZZLE (W/ O-RING) FOR BETTER AIR SEAL