The Bolt CNC aluminum piston is constructed out of aluminum for durability with the B.R.S.S. recoil system but with a steel piston rack to provide longevity. Aluminum ported piston head with an slightly over-sized O-ring provides proper air seal to produce high output velocity. These parts are specifically designed to work with BOLT Airsoft Guns but are also compatible with other TM type gearboxes

Features:

• The Ultimate In Durability!
  
• CNC Aluminum Piston Body with Weight Reduction Cut-outs
  
• Uni-directional flow CNC Aluminum Piston Head
• Over-sized Piston Head O-ring
• Full Steel Teeth Piston Rack