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Upgrading the heart of your Glock 19 doesn't get much cleaner than this. The Griffin Armament ATM barrel is machined from billet 416R chromium stainless steel using 5-axis CNC work in a single holding, which means the breech, slide, and locking lug geometry all line up the way they should. That translates to tighter groups without giving up the reliability the G19 platform is known for. It fits both Gen 3 and Gen 4 frames, wears a black nitride finish for corrosion and wear resistance, and rides a 1:10 twist rate through broach-cut rifling.
Griffin spent a couple years dialing in the fitment on these barrels, and it shows in the details. The 9mm chamber is cut to SAAMI spec and then hand-polished, so it feeds a wide range of ammo cleanly, from cheap range fodder to your carry loads. The muzzle is target crowned and threaded 1/2×28, which is the standard pitch for most 9mm suppressors and muzzle devices. Bare barrel length runs 4.550 inches, and it stretches to 4.755 inches with the comp installed.
The included Micro Carry Comp (MC²) is the standout piece here. It's a compact, lightweight compensator built specifically for carry use, so it keeps a low signature and slides into most holsters without any modification. Despite the small footprint, it takes real bite out of muzzle rise for faster, flatter follow-up shots. Griffin recommends torquing it to 8 ft-lbs. If you'd rather run a suppressor or a different device down the road, the threads are right there waiting.
Griffin Armament builds these in-house in Watertown, Wisconsin, and backs them with a perpetual lifetime warranty. For anyone who leans on their Glock 19 and wants a serious accuracy and controllability bump, this is a smart, drop-in path to get there.
Yes, this barrel is designed as a drop-in fit for both Glock 19 Gen 3 and Gen 4 frames. Griffin spent about two years refining the fitment so it drops in without sacrificing factory reliability. Most users report it slips right into the slide with no fitting required.
The muzzle is threaded 1/2×28, which is the standard pitch for the vast majority of 9mm suppressors and muzzle devices. You can remove the Micro Carry Comp and thread on your suppressor or a different comp anytime. That flexibility is a big part of why folks pick a threaded barrel over a stock one.
The Micro Carry Comp redirects gas to cut down on muzzle rise, giving you flatter, faster follow-up shots and better overall control. It's built compact and lightweight specifically for carry, so it keeps a low signature and still fits most holsters without modification. Griffin recommends torquing it to 8 ft-lbs when installing.
It's machined from billet 416R chromium stainless steel using 5-axis CNC work, then finished in black nitride for corrosion resistance and added surface hardness. The 9mm chamber is cut to SAAMI spec and hand-polished for reliable feeding across a range of ammo. Griffin backs the barrel with a perpetual lifetime warranty.
| UPC | 791154083376 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | GAG19G4TB |
| Product Type | Barrel |
| Model | |
| Color | Black |
| Caliber/Gauge | 9mm |
| Barrel Length | 4.5" |
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