Have a new .177 magazine for an Atomic XR that sticks pretty bad. It hangs on the last few shots (won't always cycle through). Moving it by hand, you can feel it is a little grindy when first rotating. Has anyone taken these apart? There's a hex screw in the center that I would assume is for disassembly, but it's pretty tight, might be loc-tited, and I don't want to force it or use heat if there's potential for damage, as I am not sure if there are any o-rings in there. I don't want to send it back if it is an easy fix.