In many cases, factory rebuilt Glocks start as display models and/or have cosmetic blemishes that do not pass Glock Inc.’s quality control. When that happens, the firearm is sent back to Glock, where they replace worn parts, refinish the metal, and list the firearm as a ,rebuilt., The already legendary G43 is a GLOCK single-stack, 9 mm Luger pistol. It is ultra-concealable, accurate, and an excellent tool for shooters of all hand sizes. The grip features a built-in beaver tail design that allows the shooter to achieve a high and tight grip.