So today the KKM barrel got it first work out. Tula steel, federal aluminum, federal brass and Winchester brass. When I first opened the box I liked the look. Satin chamber, polished barrel. Very well made with a nicely polished chamber and feed ramp. Crown is sharp and polished and rifling is smooth and clean. Ruger should let this guys make their barrels. I did however notice this barrel had marks from being cycled through an action so I just assume this is part of the fitting before shipping. Chamber support is spot on with the glock barrel, but the chamber is much tighter although each ammo past the plunk test.
Well this review is pretty boring. The barrel worked ... Very well. Off hand my groups closed and spent brass is nice and bulge free. All rounds feed with out issue.
I will say the hype around KKM is not hype. It takes perfection and makes it better. My only suggestion would be black versions, but that's about it. If you shoot .40 cal Glocks get one.