SP System T8 Bolt Carrier Hammer Assist for TM MWS (Super High Speed)

- For TM MWS Bolt Carrier Super High Speed Cycling 
- More Gas Efficacy
- Materials: S45C Steel (QPQ) & SUS 304
- Fit for Marui MWS M4 GBB series

*Important notice from T8*
You must drill two 2.5mm hole at the bolt carrier to discharge gas, if u don't it will effect the efficacy！