Hello chaps, so the other day I was rooting throught the loft a d came across some stuff that not been used in a while amongst it were a couple of aegs. One being a p90 (tm I believe) hooked up a battery and it still works. However I've tried to put some bbs through it and I don't shoot. But when it does dry fire and you can feel the burst of air coming out the barrel. Anybody got a idea of what could be wrong with it. Cheers guys ?