AR-15 – 300 BLACKOUT

Description

AR-15 .300 Blackout Custom Barrel

We make this AR-15 barrel in .300 Blackout. Take a look at the listed steel, twist, barrel length, gas-system and finish choices for this product.

Why .300 Blackout?

.300 Blackout, sometimes written .300 BLK, is its own cartridge, not the same ammunition as .223 Remington or 5.56 NATO. It is widely discussed because factory ammunition comes in both supersonic and subsonic varieties.

Those terms describe projectile speed, not two different chamber names. Reliability with particular ammunition depends on the complete rifle and setup, so don’t assume every combination works the same way.

Customize Your AR-15 Barrel

• Barrel material and twist: Chrome-moly 1:7 or 1:8, or stainless steel 1:5.
• Length and muzzle: Choose among the listed lengths, crowns and muzzle finishes.
• Gas system: Review the gas-system lengths and optional gas tubes displayed for the selected barrel.
• Profile and gas block: Check the barrel profile, gas-block diameter and any optional fixed or adjustable gas blocks.
• Finish: Fluting, Cerakote and other finish choices depend on the configuration.
• Related components: Review any matching-bolt or customer-supplied part selections. Don’t assume every optional component is included.

Before You Order

• Confirm your rifle: This product is for an AR-15-pattern configuration chambered in .300 Blackout. Verify any related receiver, bolt and other component requirements.
• Check ammunition: Use the cartridge marked for the barrel’s chamber, not a different cartridge with a similar name.
• Review every selection: This is a made-to-order barrel. Check the options and separately selected components before checkout.

Barrel Options Explained

CM and SS: CM is chrome-moly steel, which needs protection against rust. SS is stainless steel, which resists corrosion better but still needs regular care. Check the listed material/twist choices for this chambering.

Twist rate: A marking such as 1:10 means the rifling makes one complete turn over ten inches. It isn’t a barrel-length measurement.

Gas-system length: The selections for this barrel include Pistol-length (about 4 inches) and carbine-length (about 7 inches). These describe nominal gas-system layouts, not barrel length or the tube’s exact measured length.

What is a gas tube? In a conventional AR system, the gas block directs some gas through a small tube toward the action. The tube is a separate component from the barrel and gas block. If you need one supplied, review the Add Gas Tube? option where offered. Gas-tube selection corresponds to the applicable gas-system layout.

Barrel profile: This barrel offers SOCOM and HBAR contours. These describe the barrel’s exterior shape and amount of material. A lighter contour generally weighs less, while heavier contours have more material.

Gas-block size and selection: This product shows .750-inch gas-block mounting sizes. Those numbers describe the barrel’s outside diameter at the mounting area, not bullet caliber. The block can be selected as an add-on where offered. Fixed and adjustable designs are different options. Customers with their own compatible block can choose a no-block option where available; matching diameter alone doesn’t establish full compatibility.

Muzzle finishes: A target crown is an unthreaded muzzle finish. The threaded option for this barrel is 5/8×24. Magna Port uses gas-venting cuts near the muzzle intended to help manage muzzle rise; it isn’t a screw-on attachment. Gill Cut is a specialty gill-style muzzle cut. Ask us about the current pattern rather than assuming it works like porting or threads.

Fluting restrictions: Some fluting and muzzle-finish combinations aren’t offered together. The product choices reflect those limitations.

Barrel extension: This steel component at the rear of the barrel provides the locking surfaces for the bolt. It isn’t the gas block.

Fluting and finishes: Fluting cuts grooves along the outside of the barrel. Cerakote and other listed finishes affect appearance and surface protection.

What Happens After You Order?

We make the barrel to your chosen specifications. The estimated production time shown for this product is 3–8 weeks, not a guaranteed delivery date. Contact us promptly with your order number if you notice an error or need an update.

Common Questions About This Barrel

Questions Before You Order?

Not sure about .300 Blackout or the options for your rifle? Email us about this barrel or use our Contact page.

Returns and warranty

Shipped barrels are final sale for discretionary returns. A 15% cancellation fee applies after work has started. We evaluate manufacturing-defect concerns under our warranty; covered problems are addressed through an appropriate remedy. See our Refund Policy and Terms of Service.