The LW 9mm conversion barrels will work fine in most .40s, I've done about 5k of testing with a 34 barrel in a G35 just to see. Also, I agree with whomever said don't put a 10mm barrel in your .45 ACP Glock. The recoil springs, extractors, slides, and a bunch of other things are different from the 10mm to the .45 that trying to shoehorn 10mm in a .45 is just asking for trouble.