Are you looking for a power and gas efficient upgrade for your WE GBB G series? Then this is something that you should definitely have! A Plus Airsoft's Techincal knockount System upgarde kit for the WE G Series increases the overall gas flow rate but will only release a certain amount each time making the fps relatively similar with each shot till the magazine runs out! In turn, it increases the muzzle velocity and improves the shooting experience!
However, if you wish to use this, we suggest you make sure your GBB has a metal slide as it'll most likely break a GBB with a plastic slide! You have been warned!
Powered increased by 15-20fps after installation.