They had some issues in the past. ...
Brownells AR mags are good to go. Mine are great, use them all the time. I don't know where the issues idea come from, cause I don't remember seeing anyone say bad things around here, and the bad reviews on Brownells look like they were written by people who have never held an AR. One of the 1 star reviews on there came from a guy because, "the dry film finish scratched easily and didn't look good after a few uses." That "guy," and I use the term loosely, obviously has no idea that real mil mags are supposed to be like that. Hard to hate on Brownells for that. Only problem I had with them was the original price was way too high, but they've since come way down. I think they're $10 a pop right now... I'd give it a go OP and pick up a few and try em out... mags are disposable mil property, they're expected to break, get lost, even (if) stolen, unless you had something on the order of a ton of them.. you're not ever going to get called upon and even then... only to find who stole em in the first place.