Does your strut bridge look like this
http://www.e-gunparts.com/product.as...ductSKU=723720 ?
I'm guessin one or both of tabs on the strut bridge sheared off.
Unlocked 010.jpg This part failed in my Camp .45 abut 8-10 yrs ago I made my own replacement from saw blade steel and thousands of rounds later all is still well.