Antsi, the gun with the fluted chamber you are referring too is the H&K P7 (unless there is some other out there I don't know about). Though, AFAIK this was done to aid in extraction and is incredibly effective. In fact, it's so effective that people have done tests and there is actual video out there somewhere (saw it on Youtube or Google video) showing how, because of the fluting and blowback design, even with the extractor completely removed the gun still operates perfectly and ejects spent shells properly.
I don't know enough about gun-smithing to know what mods it would take, but if I could get the parent gun for around $300-$400 and have a barrel made for less than $200 I'd buy it! Of course, I would need to palm the parent gun to see how well it fits me. I have had no problem with all but a few double stacks, and the CZ 52 fits my hand nice, but it would have to fit my hand much better than the Beretta 92F (had to use to qualify with in the Air Force) or the Ruger P89. I could definitely accept lower capacity for a better grip, but would hope to have a 15rd mag, but even as low as 12 would be acceptable.
