I'm sure someone has, but didn't find much info on the web when searching. I have decided I have no desire to shoot Limited any time in the near future and have a bunch of .40 ammo loaded ahead to burn up, so talked myself into putting one together. I used a New Frontier Armory bolt and Kaw Valley barrel from Joe Bob's on a lower that takes Glock mags. I had some feeding issues I'm thinking related to the bolt, so had to get that worked out. Seems like the longer and fatter case makes things more critical to be just right. Another problem is that Glock .40 mags swell enough when fully loaded to be a bit too tight in both style lowers I have. It's not just a couple of mags either as I have some brand new ones and all are tight. I have one lower from Joe Bob's and one from PSA. They are both a bit different, but the PSA has a slightly larger opening on the magazine well. I'm thinking it is going to need opened up just a little more, though. I do have a muzzle brake on it and recoil is not much different from the 9mm rifles I have.