Many of the parts are interchangeable. I've replaced many parts in mine just to make it function, .
The AMT Hardballer is not a mil-spec 1911, though many of the parts are interchangeable. AMT quality does not represent the overall quality of the 1911 pistol
Back in the late 80's I asked the experienced IPSC shooters about buying an AMT. They said it would work fine, as long as you replaced enough of the AMT parts with Colt parts.