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Gen 3 & 4 Glock Threaded Barrel & Fluted Barrel Standard Length - Match Grade Hexagonal Profile by IGB Austria - ZFI-Inc
BARRELS GLOCK® SILENCERCO THREADED BARREL FOR GLOCK 17L 9MM 1/2X28 - Brownells UK
Double Diamond Threaded Barrel for Glock Gen1-4 | Best Glock Accessories | GlockStore.com
FYI Glock has new factory threaded barrels (1/2x28 RH) on their store website (first time I've seen American-style threadpitches available, not their European M13.5x1 LH threaded barrels) : r/Glocks
SilencerCo Threaded Barrels: Beretta, Glock, H&K, and more...