Mine works fine with whatever mag I use...it's a 1911. A non-spec 1911 .45 would be a...wait for it...paperweight! Seriously, should be no problem. If there is, it's a gun problem...contact Remington. That said, there are some finicky guns out there, but usually in calibers other than .45. I have an otherwise exemplary STI Trojan in .40 that will run perfectly with STI .40 magazines...period! 9mm 1911s are especially ...I've found Springfield mags to work the best in the 9mm KimberbTarget mynSweetie appropriated...
Michael B