TheSpectre

I was using nuprol 3.0

I just refilled them to see but there seems to be no hissing sound

Kryptek camo

So I recently bought a KWA USP .45 and when I first fired the gun I could shoot all the bbs from both magazines fine but today when I went to a skirmish I could shoot 5 bbs from the gun then the magazine would just have zero gas left it was also the same on the other magazine I own and since I'm kinda new to the sport i don't know what is happening to them