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; .357 Sig Glock 31. 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!