All 6 of my 5 rounders work flawlessly in both my Brno Mod2s: a mix of CZ, Brno, and JW15 mags. The other 9 round one can be a tad finicky, mostly if it's got anything touching it, as the fit is just a tad loose in the magwell and it presents the cartridge slightly too nose up. That could be fixed I'm sure, just haven't.
It's nice having several loaded mags in top pocket. More time spent doing what you're doing, rather than loading loose rounds into a magazine with cold fingers, the part empty box gets floppy and emptying from the tray can be tricky, blah blah
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