Worked fine, fed everything, and gives visual feedback. no complaints. - FAB Defense Ultimag AR-15/M16 5.56x45mm NATO 30 Rounds Rifle Magazine

The FAB Defense Ultimag 30R ran flawlessly in my AR — no feeding issues, no fitment problems, just clean, consistent function. The polymer body feels solid but light, and the transparent window is a nice touch for quickly checking round count.

It locked in tight, dropped free easily, and cycled both supersonic and subsonic .300 Blackout without complaint.