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I've used the Corwin Arms mags and they work fine. Some makes of aftermarket ones aren't good. For example, I have a commercial 5 rounder around somewhere that's too big to fit into the mag well.
I've been going to gun shows and I found two AI marked 15 rds mags at the show in Vankleek Hill. One has some surface rust and the other is brand new still had some type or oil/grease on it.
Ordered some usgi magazines from fulton armoury through an importer.
Not the cheapest route, I honestly found kci magazines good although overpriced in canada.