IMHO, First choice - Mec-Gar (Bradster has them at good prices), second choice - CZ. I use them both, and have taken them apart and compared side by side. I have some "cheap" high caps that I no longer use in my Ruger; it gets annoying when they fall out during firing and require machining to fit. I don't know why it so INCREDIBLY DIFFICULT for the majority of aftermarket mag makers to copy and produce a sheet metal box with a spring in it.