Does anybody know where they are selling these at? I have found a couple on Gunbroker but am at a loss here. I am looking for the M13.5x1LH for a Glock 19. These barrels are more expensive than the other brands and I want to price shop for one. Thanks Are these barrels better than the other after market brand threaded barrels? Anybody have any experience with one of the Glock factory barrels and how do they perform? Thanks..