Parts is Parts
Mostly, but sometimes not. I ran into a problem once with a friend's friend's oompact Para Ordnance that had the disconnect damaged by the sear spring. They ran it by here on his way home from the range, and a standard disconnect didn't even come close to interchanging. They had to go to Para Ordnance for a new one, and Para wouldn't send one. They had to send in the pistol.
If your front porch collapses and kills more than three dogs...You just might be a redneck