The ATI Outdoors AR-15 223/5.56 Muzzle Brake Jam Nut is the essential finishing piece that ensures a rock‑solid connection between your muzzle brake and barrel. Engineered for the demanding needs of AR‑15 platforms chambered in .223 Remington/5.56 NATO, this jam nut delivers the perfect blend of strength, corrosion resistance, and precision threading.

Key Features & Benefits

• Precise 1/2‑28 Thread: CNC‑machined to exact 1/2‑28 specifications for a perfect fit on all standard AR‑15 muzzle brakes.
• Black Oxide Finish: Provides superior corrosion resistance while giving a sleek, tactical appearance that matches any black‑finished firearm.
• Durable Construction: Made from high‑grade steel, the jam nut resists wear, deformation, and stripping even under heavy recoil.
• Easy Installation: Threaded design allows quick hand‑tightening or use of a torque wrench for consistent torque settings.
• Secure Lock‑up: Eliminates any movement of the muzzle brake, ensuring consistent muzzle velocity and accuracy.
• Universal Compatibility: Ideal for all AR‑15 rifles chambered in .223 Remington or 5.56 NATO, including civilian, law‑enforcement, and tactical builds.

Product Specifications

Why Choose ATI Outdoors?

ATI Outdoors has built a reputation for delivering premium firearm accessories that combine meticulous engineering with rugged durability. Every component, including the Muzzle Brake Jam Nut, undergoes rigorous testing to meet military‑grade standards, giving shooters confidence in every shot.

Installation Tips

1. Ensure the muzzle brake is fully seated against the barrel’s thread.
2. Hand‑tighten the jam nut clockwise until snug.
3. Use a torque wrench set to 15‑20 ft‑lb for a secure, repeatable fit.
4. Re‑check the nut after the first 5–10 rounds to confirm no loosening has occurred.

Customer Reviews

"The black oxide finish on this jam nut looks great on my custom AR‑15. It stayed tight after hundreds of rounds—no movement at all." – Mike D., Tactical Shooter

"Perfect thread match, easy to install, and the build quality is top‑notch. Highly recommend for anyone building a reliable rifle." – Sarah L., Competitive Shooter

Frequently Asked Questions

Is this jam nut compatible with muzzle brakes that have a 1/2‑28 left‑hand thread?

No. This jam nut is designed for the standard right‑hand 1/2‑28 thread used on most AR‑15 muzzle brakes.

Can I use this jam nut on a barrel that has a different finish (e.g., chrome‑moly or nitride)?

Yes. The black oxide finish provides a protective barrier that works well with most barrel finishes, preventing galvanic corrosion.

Do I need any special tools to install the jam nut?

Only a basic wrench or a torque wrench if you prefer a precise torque setting. Hand‑tightening is sufficient for most applications.

Package Includes

• 1 x ATI Outdoors AR-15 223/5.56 Muzzle Brake Jam Nut (1/2‑28, Black Oxide)

A.5.10.2255

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