Arm or Ally Duty Series Barrel for Glock 21
0.00050 
0.02142 
54.99000 
0.55621 
54.99275 
0.12440 Arm or Ally Duty Series Barrel for Glock 21
Made in the USA – Non-Threaded
The Arm or Ally Duty Series Barrel for Glock 21 is a non-threaded drop-in replacement designed for those who demand reliability, simplicity, and solid performance. It’s compatible with Glock 21 Gen 1–4 frames as well as P80 PF45 builds chambered in .45 ACP.
Each barrel is proudly made in the USA from premium 416R stainless steel. Heat-treated for strength and durability, this barrel features a 6-groove, 1:16 twist conventional rifling for smooth, consistent accuracy.
Built for shooters who prefer no-frills functionality, the Duty Series delivers timeless design with everything you need and nothing you don’t. It’s a clean, high-quality upgrade that drops in with ease and performs under pressure—whether at the range or on duty.
If you’re looking for a reliable, American-made barrel with precision machining and a classic aesthetic, the AOA Duty Series G21 barrel fits the bill perfectly.
Specifications
- Made in the USA
- Glock® 21 Gen 1–4 compatible
- 416R Stainless Steel construction
- 6-Groove, 1:16 Twist Conventional Rifling
- SAAMI-Spec .45 ACP Chamber
What is the Arm or Ally Brand?
Arm or Ally branded products are manufactured in the same facilities and to the same standards as many popular, high-end brands. Our promise to you is a high-quality product at a more affordable price—100% American-made products backed by the same defect-free warranty as every other product we offer.
...unless you like paying for their marketing and fancy packaging!
Product Information
| Finish | Titanium Nitride, PVD, QPQ Nitride, Raw |
|---|---|
| Platform | Glock |
| Caliber | 45 ACP |
| Compatibility | G21, Gen 1-4 |
| Features | 6 Groove Rifling, Non-Threaded |
| Made in USA | Yes |
| Manufacturer | Leading U.S. Manufacturer |
| Material | 416R Stainless |
| Twist Rate | 1:16 |
| Color | Black, Stainless Steel, Gold, Rainbow, Rose Gold |
We fully comply with all federal, state, and local laws regarding the sale of restricted products. We do not market or sell to prohibited jurisdictions, and any attempts to induce illegal activity, including by law enforcement or government agencies, will be rejected and may be reported. All orders are subject to legal verification, and those in violation will be canceled. By using this site, you confirm compliance with all applicable laws.
Arm or Ally is a stocking dealer for all Aero Precision, Faxon Firearms, Ballistic Advantage, HOLOSUN, Toolcraft, Elftmann Tactical, Timney, TriggerTech, HIPERFIRE and was named the #1 Overall E-Commerce Dealer for Aero Precision Products in 2020!
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