Mr. Hop Up Silicone Bucking - 70° Degrees

- For GBB/VSR10 spec inner barrel and without modification
- Anti-frozen silicone material
- Stainless c-ring included for tight sealing. Optional installation.
- Larger & wider contact area inside of BB, has better hop effect with heavy BB
- For Heavy BB only
- The "Shield" shape groove design has better hop effect when tensioner/lever press it
- Retain the steel "C-ring" design for air seal from "Transformer HOP" series 

Suggestion of use:

Yellow 60° - muzzle velocity below 100 m/s

Blue 70° - muzzle velocity 100~130 m/s

Red 80° - muzzle velocity 130~160 m/s

Black 85° - muzzle velocity above 160 m/s