I recently got a P18.9 Pro Custom in 9mm and quickly started to source extra mags. As I was working on a order with one of my distributors, I noticed they had a Remington mag that fits their "new" double stack 1911 in 9mm. I'm pretty sure the frame of that "Remington" 1911 is from Para since they bought them, both guns look the same. Long story short, I added a mag to my cart just for s&g. It fits great, locks the slide back and drops free. I have not ran any rounds through it yet but will soon. The mag is an exact copy of my factory Para mags but with holes cut out on the rear to show each 1-19 rounds.
The Remington part # is 17794, here is a link that I found on the net to show pics since my PB account isn't working. http://www.centerfireguns.com/remington-1911-match-9mm-mag-bl-18rd-17794.html