Prime Day Doorbusters | Up to 50% Off! | Shop Now

AT3™ .300 Blackout Medium Profile 10.5 Inch AR-15 Barrel

SKU: AT3-300-10.5

Sale!
Out of Stock

Join the waitlist to be emailed when this product becomes available

Orders will Ship within 1 Business Day
Backed by the AT3 Lifetime Warranty!
TOP ADD-ON'S
AT3™ Low Profile Steel Gas Block + Gas Tube + Roll Pin Combo

AT3™ Low Profile Steel .750" Gas Block + Pistol Gas Tube Combo

$35.99
AT3 Tactical Spear M-LOK Free Float Handguard 9 Inch with Slick Side Billet Upper Receiver

AT3™ AR 15 Upper Receiver and SPEAR Handguard Combo - Black, 9 inch

$135.99

10.5 Inch .300 Blackout Barrel by AT3 Tactical

This 10.5 Inch .300 Blackout Barrel makes a great choice for your short, heavy-hitting pistol or SBR AR-15 builds. Made from 4150 CMV steel per Mil-B-11595E, and finished with a durable black nitride treatment, this barrel holds up under pressure, with excellent corrosion resistance. This barrel fits all your standard AR-15 uppers if you’re going for a fresh build, with M4 feed ramps for reliability.

This barrel uses a .750″ diameter gas block, plus a Pistol length gas tube, both of which you can snag here at a lower, bundled cost. If you’re looking to start fresh with a complete upper assembly, check out our selection of upper and handguard combos! For this barrel, we’d recommend a handguard around 9 inches long to ensure you can access the muzzle threads. Which is ideal if you plan to suppress it!

All NFA/ATF Rules Apply
You may use this barrel with a lower receiver that is a Registered SBR, Machine Gun, or Pistol. Possession of this barrel along with a Non-NFA lower receiver is Prohibited, except when installed on a Pistol configuration firearm.

Specifications

  • Length: 10.5 Inches
  • Material: 4150 Chrome Moly Vanadium
  • Profile: Medium
  • Finish: Black Nitride
  • Gas System Length: Pistol
  • Gas Block Journal: .750″
  • Twist Rate: 1:7 inches
  • Muzzle: 5/8×24 Threaded
  • Barrel Extension: M4 Feed ramps
  • Weight: 21 oz.

Where are these barrels made?

AT3 has partnered with Kinetic Manufacturing, a trusted OEM manufacturer for the firearm industry to produce these barrels. We have a philosophy that great parts for the AR don’t have to break the bank, and these barrels are no exception. Our lifetime warranty on these barrels applies to any defects due to workmanship. In the unlikely event you run into an issue, we will take care of you.

Specifications:

Caliber.300 Blackout
Barrel Length10.5 inches
Barrel Twist Rate1:7 inches
Barrel Material4150 CMV
Muzzle Threads5/8/2024
Barrel FinishBlack Nitride
Gas Block Size.750″ Gas Block
FitAR-15
Barrel ProfileMedium
Barrel Gas SystemPistol
Gas Block Journal Length1.9 inches
Barrel ExtensionM4
Weight21 ounces

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

AT3 Lifetime Warranty Logo

All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.

This includes AT3 Red Dot SightsHandguardsIron Sights, and any other product that carries the “AT3 Tactical” or “AT3™” name. For other brands (ex. Magpul or Troy), please refer to the manufacturer’s warranty policy.

In the event that your AT3™ product becomes unusable, we will repair or replace the product at no charge to you.

If we cannot repair your product, we will replace it with a product in perfect working order of equal or better physical condition. The warranty is fully transferable, but we may require information about the original purchase to validate the authenticity of the product.

If your product is in need of warranty service, please contact AT3 Tactical to start the process

Our contact info is available here. To expedite processing, please provide your order information and description of the defect.

Please note: The AT3 Lifetime Warranty does not cover loss, theft, intentional damage or cosmetic damage that doesn’t affect the performance of the product.

Customer Reviews

Based on 1 review
100%
(1)
0%
(0)
0%
(0)
0%
(0)
0%
(0)
R
Russell Martin
Fostech caged suppressor build.

Well I haven't had a chance to shoot it. But the build went well with all I bought. The Wojtek adjustable gas block went on the 10.5 barrel without any problems. My suppressor went inside the Midwest guard nice as planned. You guys are fast shippers. Thanks,I'll be back. Here is a picture of the Fostech caged suppressor build

Customers who viewed this item also viewed these products

AT3™ 300 Blackout Medium Profile 14.5 Inch AR-15 Barrel

(no reviews yet)
$130.00$110.50
14.5 Inch .300 Blackout Barrel by AT3 Tactical This 14.5-inch .300 Blackout Barrel makes
AT3 Tactical 10.5 Inch 300 BLK Complete AR-15 Upper Assembly - No BCG or Charging Handle

AT3™ 10.5 Inch .300 Blackout Assembled Pistol Upper for AR-15...

$391.99
AT3 10.5″ .300 BLK Pistol Upper with SPEAR M-LOK Handguard AT3 Complete Upper assemblies
AT3™ 10.5 Inch .300 Blackout Pistol Upper for AR-15 - With Nickel Boron BCG and Mil-Spec CH

AT3™ 10.5 Inch .300 Blackout Complete Assembled Pistol Upper for...

(no reviews yet)
$0.00
AT3 10.5″ .300 BLK Pistol Upper with SPEAR M-LOK Handguard Built to Order –

AT3™ 300 Blackout Medium Profile 7.5 Inch AR-15 Barrel

(no reviews yet)
$105.00$89.25
7.5 Inch .300 Blackout Barrel by AT3 Tactical This 7.5-inch .300 Blackout Barrel makes

AT3™ .300 Blackout Medium Profile 16 Inch AR-15 Barrel

$130.00$110.50
16 Inch .300 Blackout Barrel by AT3 Tactical A 16 inch .300 Blackout barrel

AT3™ 300 Blackout Medium Profile 6 Inch AR-15 Barrel

(no reviews yet)
$100.00$85.00
6 Inch .300 Blackout Barrel by AT3 Tactical This 6-inch .300 Blackout Barrel makes
Ballistic Advantage 10.5" 300 Blackout Barrel

Ballistic Advantage 10 Inch Distinct Rigid Profile .300 Blackout AR-15...

Ballistic Advantage Modern Series barrels feature precision-machined 4150 CMV steel, durable Nitride coating, and

AT3™ 5.56 NATO Medium Profile 7.5 Inch AR-15 Barrel

$105.00$89.25
7.5 Inch Medium 5.56 NATO Barrel by AT3 Tactical With a sturdy profile and
Odin Works AR-15 300 Blackout Barrel 10.5" Pistol

Odin Works AR-15 300 Blackout Barrel 10.5" Pistol

(no reviews yet)
$242.25$205.91
Effective & Extremely Flexible 300 BLK 10.5″ Barrel This Odin Works 10.5″ 300 AAC
Ballistic Advantage 10.5" 300 Blackout Barrel

Ballistic Advantage 10.5 Inch Distinct Rigid Profile .300 Blackout AR-15...

Ballistic Advantage Modern Series barrels feature precision-machined 4150 CMV steel, durable Nitride coating, and

AT3™ 7.62x39 Medium Profile 16 Inch AR-15 Barrel

(no reviews yet)
$130.00$110.50
16 Inch 7.62×39 Barrel by AT3 Tactical This 16-inch 7.62×39 Barrel makes a great
AT3 Alternator AR-15 Pistol

AT3™ AT-15 ALTERNATOR Pistol 10.5 Inch .300 Blackout Barrel -...

(no reviews yet)
$1,099.99$879.99
AT3 Tactical ALTERNATOR .300 BLK Pistol – The Ideal Defense The ALTERNATOR .300 BLK

AT3™ 5.56 NATO Government Profile 10.5 Inch AR-15 Barrel

(no reviews yet)
$112.50$95.63
10.5 Inch 5.56 NATO Barrel by AT3 Tactical This 10.5 inch long 5.56 NATO
KAK Industry 8.5 Inch OE-SPEC Pistol Gas 300 Blackout AR-15 Barrel

KAK Industry 8.5 Inch OE-SPEC 300 Blackout AR-15 Barrel

(no reviews yet)
$115.31$98.01
Compact 300 BLK Versatility with KAK’s 8.5″ Barrel This 8.5″ 300 Blackout barrel provides

Bear Creek Arsenal .300 Blackout 16 Inch AR-15 Barrel -...

(no reviews yet)
$87.13$74.06
Bear Creek Arsenal .300 Blackout 16 Inch AR-15 Barrel – Nitride Heavy Profile –

Frequently purchased together

AT3™ Low Profile Steel Gas Block + Gas Tube + Roll Pin Combo

AT3™ Low Profile Steel AR-15 Gas Block + Gas Tube...

$35.99
Buy As A Set And Save! This combo includes your choice of 4 different
ATI AR-15 Shark Muzzle Brake w/Crush Washer - .223/5.56 NATO 1/2×28

ATI AR-15 Shark Muzzle Brake w/Crush Washer - .223/5.56 NATO...

$33.99
Stunning 556 Muzzle Brake With Distinct Looks & Reliable Power The ATI AR15 Shark
Black Rain Ordnance Adjustable .750 Gas Block

Black Rain Ordnance Adjustable .750 AR-15 Gas Block - Includes...

$39.99
Lightweight & Durable Gas Block For .750 Barrels The Black Rain Ordnance Adjustable .750
Lancer L5 Advanced Warfighter 30 Round .300 BLK AR-15 Magazine - AT3 Tactical

Lancer L5 Advanced Warfighter 30 Round .300 BLK AR-15 Magazine

$19.99
.300 Blackout Polymer and Steel Hybrid Magazine Lancer’s .300 Blackout specific L5AWM magazine features

Magpul PMAG M3 30 Round Magazine 300BLK - MAG800-BLK

$15.15
Purpose-Designed Magazine For Rifles Chambered In 300 Blackout The Magpul PMAG M3 300BLK is

Questions & Answers

Don't see the answer
you're looking for?

Loading questions...