Thanks all, more options the better. I had tried to phone Colt before originally posting but they're closed until after New Years. Williamlayton, I went to Willis Arms' website, looks like they specialize in exactly what I need, thank you. It's pitted just enough I don't think I'd be satisfied with anything I could do myself, needs some draw filing, combination of buffers, etc, like Willis and others would have. Bad part is I can't expect anyone to give me a halfway accurate estimate over the phone without an inspection.