Oddly enough, the last few Rock Islands I've owned had suprisingly very good fitment of parts. Almost a seamless blending of the rear of the slide/extractor/ejector. In terms of fit, it absolutely blows away my 70s Colt Commander. That being said, the old fuddlore rumor that "they're built on old Colt tooling" is utter nonsense. Yes, after WWII that may have been the case, but they aint building guns on 80 year old tooling anymore, nor have they been for several decades. And there's nothing wrong with that, they build fine guns for the money. All that being said, they still don't even remotely compare to anything like a Nighthawk, or even something like a Springfield TRP.