Issue with MSAR mags for AR??

[hacktracker]

I picked up a few MSAR mags at a VA Gun show for $8/each after seeing a good review on Youtube from James Yeager/Tactical Response.

I noticed an issue with cartridge retention with movement and made a video...

CLICK-FOR-VIDEO

I have not taken these to the range yet and I hope they will work fine.

Is this an issue???

TIA,

Don