I have a Gen4 35 with a KKM conversion barrel in it and love it! I'm loading MG 124's with 4,2gr of N320 making minor and this is the softest gun I've ever shot. We tried the same load in an STI limited gun, a stock 34, and a stock 17L and it still didn't compare. Next I'm going to try a conversion barrel in my 24 and see if there's any difference. I'm not sure if it's the heavier barrel filling the .40 hole in the slide or what but I do like this setup.