Greetings J.R., And thanks, by the way. I have placed multiple orders with Lone Wolf and have been very pleased with the company. I read in Patrick Sweeney's Gun Digest Book of the Glock that while most companies' 10mms are beefed-up .45's, the G-21 descended from the design of the G-20. Sweeney argues that basically, the G-21 is built to withstand the demanding pressures of the 10mm cartridge. I know that the G-21 has an area of the slide beveled out to reduce weight, so there are minor differences, but the overall point stands that the pistol was originally designed around the 10mm. Do you know if the Glock 30 was descended from the G-29 in a similar fashion? Thank you in advance.