My boss recently purchased an MP-5 Airsoft (not sure who makes it). We were able to follow how to load the magazines (turn the wheel at the bottom of the magazine, load the pellets, and insert into the gun when full). When inserted into the gun, we can hear the spring "spin-up" or release. But for some reason, the gun will not feed properly if at all. All we get out of it is air and once in a while, a pellet will fall out of the muzzle. Any ideas on what we could be doing wrong? The instructions aren't worth a lick. Thanks in advanced.