Yeah, Colt Mark IV NM barrels were made for Gold Cups & as such, had a narrower tang than a standard commercial or military slide, but the barrels were fairly cheap, readily available & they shoot really well.
In order to use them with standard commercial or military slides, the tang needs to be welded up & then fit to the slide.
A little work, but a cheap way to get a good shooting barrel so I've used quite a few of them.
MM
