Removing play in an Ambi Mag Catch

[Boo-Sabum Ben]

Hi all,

Have an Ambi Mag catch here, but wont play ball in my M4. Works as expected, but the mags need to be held in real tight, and this one has too much up and down movement in it to do that. It actually seems to be able to twist. Any ideas on how to remove this, so that it cant move at all, and lock the mags in better?