Need help with my KWA USP

[CCCman]

I just recently bought a KWA NS2 USP. With one charge from my propane, i am getting about 12 shots, then the gun runs out of gas. What is wrong? And just to be on the safe side, exactly how do you charge a magazine with propane correctly? And sometimes after i insert the magazine ad slap it to make sure it is in, after shooting a while, it randomly falls out, is this happening to any of you?

My Gun- http://www.airsoftgi.com/product_info.p ... ts_id=7834

My Adapter- http://www.airsoftpost.com/product_info ... s_id=29237

[Jester316]

[youtube]http://www.youtube.com/watch?v=vFA3GjqgsjA&feature=related[/youtube]

[CCCman]

ok, so i took my mag out, held the release valve down then filled it and very little gas was going out the release valve. Does this mean theres a problem with my fill valve?

[Jester316]

Try a brand new propane tank. Low ones cause under filling.

[CCCman]

i just bought this tank yesterday though, could it of been a bad tank?