Brownells has come out with their own new AR magazine in 20- and 30-round flavors. They back them 1000%. I like to buy GI contract mags and put Magpul followers in them. I have no use for mags that do not have a "closed" rear face around the shells. The aluminum mags have this closed face; most of the steel aftermarket ones do not. They tend to jam to the point that you'd want to kick your cat when you get home.
I have some 20 and 30 round Brownell's mags, along with the SA80 steel and a bunch of USGI surplus 30 rounders. The Brownell's are great. Never any problems with any of them. I have never had a jamming problem with any of my rifles/magazine combinations.
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