Features

• Grooved steel cylinders for heat dissipation
• Steel ball-bearing 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 with O-Ring for better air seal
• Compatible for M4-A1, M4-RIS, SR-16, M733