The Griffin Armament ATM Threaded Barrel for Glock 19 Gen 3/4 (Griffin part no. GAG19G4TB) is a drop-in 9mm replacement barrel with a 1/2-28 threaded muzzle and a Micro Carry Comp. ATM stands for Advanced Threaded Match: the barrel is billet machined from 416R stainless steel, with all critical dimensions cut in a single work holding. Griffin designed it with concealed carry in mind, so it adds suppressor and accessory support without giving up factory reliability. For a Gen 3 or Gen 4 Glock 19 owner who wants a threaded muzzle and a compensator in one install, this is the barrel.

Key Specifications

• The chamber is a 9mm SAAMI-spec chamber, honed and polished for reliable function across a broad range of ammunition.
• It fits the Glock 19 Gen 3 and Gen 4, which Griffin lists as the compatible platform.
• The material is 416R pre-hardened chromium stainless steel, chosen for accuracy potential through service life.
• The finish is black nitride, which resists surface wear and corrosion and adds surface hardness.
• The muzzle is threaded 1/2-28 for suppressor or accessory support.
• The muzzle has a target crown to protect the bore at the exit.
• Rifling is broach cut, which Griffin says reduces stress and improves bore uniformity.
• The twist rate is 1:10, a common rate for 9mm pistol barrels.
• Overall length is 4.550 inches, or 4.755 inches with the compensator installed.
• The included Micro Carry Comp is torqued to 8 ft-lbs, giving low-profile muzzle control.

Frequently Asked Questions

Which Glock 19 generations does this barrel fit? Griffin lists it for the Glock 19 Gen 3 and Gen 4. Griffin sells separate threaded barrels for other Glock models and generations.

Does it come with a compensator? Yes. The listing includes the Griffin Micro Carry Comp, torqued to 8 ft-lbs.

What thread is the muzzle cut to? 1/2-28, the common 9mm muzzle thread, so it accepts compatible suppressors and muzzle accessories.

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

A threaded match barrel changes a carry Glock without changing how it feels in the hand, and the included compensator means the muzzle is finished the day it arrives. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and see more Glock barrels.