I just installed a KKM barrel in a Glock 35. I had to make a minor adjustment to the feed ramp base pad by removing .003. This was so the barrel would clear the locking block when you put the slide on the frame. Seems I have somewhat of a high locking block on this gun. Not a big deal.Everything has a tolerance. Since installation I have fired 800 rds of Moly coated bullets with no issues.