I recently bought a stainless Ranch model to keep on my boat, bought a couple 20 rd. mags from Tapco (Victors)...after i got offshore I replaced the 5 rd. rugar with one of the aftermarkets and found that the latch does not go into the hole on the mag. I used a round file to ream the holes out and now they seem to work ok, rapid fire with no stoppages as of yet. It is my first Mini...figured mags. would be no problem, got a lot to learn. Glad i found this group!!!!