Guns Modify Magazine Gas Bucking #0/60°(+0.03or+0.08) TM G-Series ( 134A )

- Extreme Custom Mag Gas Buck #0 +0.03 or +0.08 /60” 134A
- 0.05 thickness Stainless Steel shim x1
- For TM/GM G-Series

To find the best clearance by adjusting the positional relationship with the nozzle