I had one mag for my 24/7 Pro 45 cal that would not hold the slide back after inserting it, and I had bought a new mag that was not feeding the rounds into the chamber, they were submarining. I sent these in about 3 1/2 weeks ago, and got two brand new mags back from Taurus. I know they are new because they are packaged exactly like the new one I bought that didn't work. I immediately thought 'oh no, what if these don't work either?" but they feed rounds into the chamber just fine, and both mags retain the slide back after inserting the mag. Gotta take them both to the range, of course, but I think they're looking good.....and I got them back fairly quickly, I'd say.