KJ Works M9 Part No. 71 Exhaust Valve

The KJ Works M9 Part No. 71 Exhaust Valve is specifically developed for the M9 from KJ Works and refers to the GBB (Gas BlowBack) magazine.

The exhaust valve allows the gas to exit the magazine, thus firing the bb. If necessary, you can also release all the gas from the magazine by pressing the button.
However, we do not recommend this after a day of shooting and always recommend leaving gas in the magazine. This is so that the silicone addition in the gas keeps the rubbers of these valves wet.