With this system, there are no expensive jig kits and parts to purchase. This is an all-inclusive pistol frame and jig kit for one great price! You won’t find a better Glock 80 percent frame. The pistol frame and jig are sturdy polymer. This kit is compatible with Gen 3, 3-pin: .9mm Glock 17, 34, 17L; .40 S&W Glock 22, 35, 24; 357SIG use; and .40 S&W Slide Glock 31, 35, 24. The kit also comes with drill bits and the end mill bits kit that's required to finish your pistol project the right way, as well as a locking block. The best part - there's no FFL required to purchase!