Originally Posted by lyphe
But i find if i hold the mag in (so its not wobbling around - is wobbling normal?) it doesn't give me this issue.
Wobbling is normal, there should be a little bit of play between the mag and the magwell.
Also, holding the mag in a certain way doesn't do anything for locking up the gun. What it does do however, is make certain mags feed better (eg. STAR, and Magpul Green Label mags that you either need to hold the mag a certain way or shim it to force it to actually feed BB's properly into the hop up)