The Griffin Armament ATM Threaded Barrel for Glock 19 Gen 3/4 (Griffin Armament part number GAG19G4TB) is a 4.5-inch replacement barrel chambered in 9mm and built for the earlier Glock 19 frame generations. Griffin Armament machines this barrel with the same Universal Taper Mount threading used across its ATM lineup, so it pairs directly with Griffin’s compensators without an adapter. High-quality components and precise manufacturing are the hallmark of Griffin Armament parts, built for maintaining and upgrading factory firearms. It is a clean upgrade path for Gen 3 and Gen 4 Glock 19 owners planning to run a threaded muzzle device.

Key Specifications

• Measures 4.5 inches in barrel length, matching the factory dimensions of the Glock 19.
• Chambered in 9mm, the standard caliber for the Glock 19 platform.
• Fits Gen 3 and Gen 4 Glock 19 frames specifically, distinct from the Gen 5 ATM barrel in the same lineup.
• Part of the ATM series, built around Griffin’s Universal Taper Mount threading for direct compatibility with Griffin compensators.
• Classified as a Barrel, giving a complete, direct-fit replacement for the factory Glock 19 barrel.

Frequently Asked Questions

Which Glock 19 generations fit this barrel? It is built specifically for Gen 3 and Gen 4 Glock 19 pistols, not the Gen 5.

What compensators fit this barrel? It uses Griffin’s Universal Taper Mount threading, so it pairs directly with Griffin Armament’s ATM-compatible compensators.

Buy the Griffin Armament ATM Threaded Barrel for Glock 19 Gen 3/4

Upgrade your Gen 3 or Gen 4 Glock 19 with a precision Griffin Armament ATM barrel built for compensator compatibility. Order it from our Griffin Armament lineup of Glock barrels and our Lubbock, Texas team will get your order ready to ship as soon as it’s available.