"Now let me specify first off that these are NOT the genuine Magpul PTS emags/pmags because those cost upwards of 20 bucks a midcap and they hold 120 rds. If you notice on the box these are manufactured by Star; these are only licensed by Magpul. Now that we got that out of the way onto the review.
When I first slapped one into my polarstar(VFC body) the first thing I noticed was how badly the mag wobbled. I had movement in all 4 directions and was nervous it wouldn't feed properly. After some silicone and breaking them in I loaded 3 magazines and they each fed every shot down to the last bb. I was impressed at the flawless performance that these mags had despite having such massive wobble. These fit my KWA M4A1 very snug and had no issues feeding either. They keep up with a high rof and are slick and light. They feel like they wouldn't be able to take a huge fall though so I wouldn't bang them too around too much. Other than that they're great."