I know there's a bit of age to this post of Rob's (24 Sep 13), but I'm citing it now because, per Rob's second sentence, I had Mark put in a ramped Kart barrel on my (original series) Delta Elite; I just got it back this past Saturday. The work he did in fitting the barrel is *exceptional*... and he also did a few little extra things that I didn't specifically call out but which his trained eye just felt needed tweaked. He showed me some of the other guns he's working on, and those he's just finished, and his craftsmanship is outstanding. (He even does grips, too, so I may have a few more projects for him in time.) I asked if I could post his phone number to the forum and he said it was okay to do so; his preferred number is (309) seven nine two - four five five six. He's usually busy, so leave a message; he's pretty good about calling you back when he's got a free moment. He kept to his quoted price and was damn close on his time estimate (he said six to eight weeks, if I recall correctly, and I think he was about a week over that).The gun was barreled by Mark Brand. He is probably one of the best "hard fit" barrel guys I have seen.