Can you try this: Take the 1911 mag apart by removing the mag plate, spring and follower. Then reach into the mag and depress the spring that may be caught in the hole for the 1911 mag catch. Hopefully, you can depress the spring enough to remove the mag and then the pistol should come apart normally.
I don' really know but I hope this works.
Added: If you can't get the mag plate off because it is blocked you may have to cut it off with a Dremel tool. The mags are much cheaper than the pistol.
Last edited by MarkB; August 7th, 2012 at 12:46 PM.