Infinty Umarex (SRC) G17 Gen5 MOS - One piece full CNC TDC hop up chamber - Black

Very high quality, installation required filing a little bit though. Barrel is locked to hop-up unit with a screw and the hop-up unit can be locked on to the gun solidly with a screw so the accuracy is very high.

Shipping was fast, product is quality. Thank you Skirmshop