I also own a Patrol in 5.56 and had the same mag wobble. I have tried various mags from H&K, PMags and GI 20 rds, of which I have a bucket full. The only problem I have had with feeds is occasional failure to pick up a round on the GI (Colt and Adventure). I treated a dozen GI 20s to replacement springs (Brownells) and tried their plastic followers (more prone to 'tip' jams than the ally originals). I also dressed down the front edge of the GI mags because of the occasional jamming of the round going forward. Cured.