My understanding is that if its a 'standard' 1911 or Colt Commander style receiver it will work. I would advise checking with the manufacturer.
They had this note at the Mech Tech web site:
Certain 1911 style pistols such as the Paraordnance line have modified receivers which leave an opening in the magazine well in an area critical to proper feeding when these pistols are used with a CCU. Mech-Tech has designed a clever insert called a 'Para Block' which solves the problem.
While at the gun show, I heard people rattle the names of lots of 1911 clones and the guy said they would all work.
They had a cool video of a guy switching it around and laying tight groups into some paper targets at 50 to 100 yards.