The only brand I really recommend is Tactical
Innovations. Not cheap, but they are the best.
Those are the all metals ones, but they also
make a plastic body version too.
But actually, I prefer the stock factory mags.
I just clip them together for "flip-flop"
20 round mags.
Not the most capacity, but I never have mag
problems.
I see mixed reviews on the Butler creek mags
with the steel lips. Some have them work fine,
some have problems. Myself, if I was going to
buy plastic, I'd probably go for the TI's..
But if I were to do that, I'd go ahead and get
the all metal version. I just like em better..
But like I say, I like the factory mags.