GHK GLOCK V2 GBB system

Suitable for upgrading GHK GLOCK G17 Gen5 GBB pistols

V2 new version with vertical TDC hop-up system

V2 new version with simplified components and improved stability

V2 new version with improved exhaust valve

Adjusted trigger pull weight from 2.5kg to 2kg

Adjusted magazine nozzle and hop-up block positioning for a more stable ejection process