Lantac 01GBG17THSS 9INE Glock 17 9mm Luger 4.48 Stainless Steel Fluted/Threaded. 48" Stainless Steel Fluted/Threaded. Lantac machined these from pre-hardened 416R chromium stainless steel with a 4in diameter and a 1:10 twist rate and they hold zero...