Sounds the o ring that holds the BBs in is either degraded or missing. Alternativly you could put a bit of tape over the end; the gas has more than enough power to push it aside. Don't use only one piece; use a small one over each hole.
Nah I want a gbb airsoft gun had all sorts of pellet pistols and rifles from co2 to pcp to ssp. I'm planning on skirmishing it too from time to time.. any way after alot of thought an research I've bought a marui m9a1 when to fore support in peterborough an had a look at a few.. the desert eagle is a beast haha bit big for skirmishing the usp's look good and the 1911's are nice but the m9 flicked every switch for me.. good looking practical and I must say I looked at a few different manufacturers and marui stood out for build quality and looks for me