I thought I saw that somewhere...here I found it again:
Source: http://www.shootingtimes.com/handgun...05/index1.htmlAll parts on the PT 1911 are manufactured by Taurus, including the magazines and the custom-style accessories, and they are specific Taurus configurations and not copies of any other brand-name designs. (Of course, all popular Model 1911 accessories, such as beavertail safeties, triggers, hammers, etc., are very similar in appearance.) Even the Heinie sights on the guns are actually fabricated by Taurus, under license and according to Heinie's strict specifications.
I'm assuming this means others won't work, but I don't know for sure. I just remembered reading that and thought I'd share.