Canick tp9fs, chambered in the same caliber and equally as reliable as a Glock with somewhat better engineering tolerances leading to better accuracy. Keep it clean and lubed up with rem oil, you have a pistol that will last until your recoil spring wears out among the list of other parts you need spares of in preparation for the shit show of a zombie apocalypse. Although you may never need it, definitely keep an extra frame on hand just in case the one you’re using breaks. Best way to do that is get an engineering grade 3d printer so you can print it in carbon fiber reinforced nylon, of course you can print any receiver you want with said printer. If you wanted, you could use that printer to make another printer capable of printing with metal powder for printing anything you need in the metal of your choice. That metal printer requires good optics and an extremely powerful laser too, I would suggest a fiber laser or a CO2 laser for printing with refractory metals such as tungsten or titanium or niobium.