Is there anything you want to know about the science of gun design? Tobias Obermeit is a design engineer at Kel-Tec and is their chief designer on the Kel-Tec PMR-30 project. He has kindly agreed to answer a set of questions which I will select from the comments below.
Feel free to post questions about gun design in general, the PMR-30 pistol and the PMR-30 SMG.
UPDATE: The questions have been answered here.