Originally Posted by SNK
With many mags, not just pmags, they will wobble and not feed properly in the magwell adapters. Many people have stuck tape and velcro inside the magwells or onto the mags to make them work. It happens with most M4 mags. I have several where you have to wiggle and push it forward to get it to feed properly.
The only mags I have found to work perfectly in the magwells are MAG branded plastic ones. I'll post about the pmag when I get it this week.
This is good to know, thanks! I wonder if it's even worth the trouble, to get these things