Description

GRIFFIN ARMAMENT ATM BARREL FITS GLOCK 21 GEN 3/4 – THREADED .578×28 – WITH MICRO CARRY COMP

The Griffin Armament ATM barrel fits Glock 21 Gen 3/4 is a precision-machined, drop-in replacement barrel made from 416R stainless steel with a Black Nitride finish designed for enhanced accuracy and reliability for concealed carry use. It features a .45cal SAAMI-spec chamber, a .578 x28 threaded muzzle for suppressor or accessory attachment, and a target crown. The barrel includes an integrated Micro Carry Compensator, and it’s specifically designed to fit the Glock 21 Gen 3 and 4, offering improved performance without compromising factory reliability.

Griffin ATM™ ( Advanced Threaded Match ) Barrels are billet machined from 416R stainless steel to exacting tolerances for the ultimate in drop in match performance.  5 axis machining done in a single work holding positions all critical dimensions on the breech ensuring theoretically perfect geometrical relationship of barrel, slide and locking lug. Hand polished chambers ensure optimal reliability with a wide range of ammunition from training to duty ammo.  Two years of research and testing provided the appropriate knowledge to machine the barrel dimensions for a perfect fitment; providing the best possible accuracy without sacrificing any factory reliability.  Designed with concealed carry users in mind, this barrel gives you the utility of accessory and suppressor support while providing uncompromising reliability.   Don’t lose confidence in your carry piece by using sub par components.

For a limited time this barrel comes with our patent pending Micro Carry Comp ( MC²), a $64.95 value and an impressive performance add on for your favorite carry piece.  The Micro Carry Comp provides low signature, optimal holster compatibility and good muzzle brake performance in a miniature and lightweight package which has near zero perceived effect on the handling and storage of the firearm.

• 416R Pre- hardened chromium stainless steel for peak accuracy potential through service life
• Compatible with G21 Gen 3/4
• .45cal SAAMI-spec chamber
• Black Nitride finish resists surface wear & corrosion while providing increased surface hardness
• .578″x28 threaded muzzle for suppressor or accessory support
• Target crowned muzzle
• Honed and polished chambers to ensure reliable function across a broad range of ammo
• Broach cut rifling for reduced stress and uniformity of the bore
• All critical machining done in single work holding for exacting tolerances and manufacturing consistency from batch to batch.
• 1:10 twist rate
• Overall length : 5.18″ / with comp : 5.46″
• Micro Carry Comp torqued to 8ft/lbs

GLOCK® is a federally registered trademark of Glock, Inc. and is one of many trademarks owned by Glock, Inc. or Glock Ges.m.b.H.  Griffin Armament is an independent manufacturer of parts and accessories that fit Glock® pistols, however it is not affiliated with or endorsed by Glock, Inc. or Glock Ges.m.b.H.  The use of Glock on this page is merely to advertise the sale of compatible parts or components.  

Manufacturer Part #: GAG21G4TB
UPC: 631465970890