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Questions & Answers
With the 10.5 inch barrel can I use a 6.6875 in pistol length gas tube with a .750 low profile adjustable gas block both from aero precision. Expert Answer

The 10.5" Rosco Manufacturing Purebred .300 AAC Blackout Barrel has a gas block journal size of 0.750 and uses a pistol length gas system. So yes both the pistol length gas tube and low profile gas block from Aero Precision will work.

by Hunter, Gear Expert, March 31, 2022
The description says "Nickel Boron" finish. Two questions. What, exactly is NiB treated? Is the feed ramp NiB treated? Expert Answer

This is what the manufacturer says in regards to their NiB treatment. "The polished Nickel Boron will aid in corrosion resistance, surface hardness, and increased lubricity. I.E. Meticulous manufacturing leads to a precision instrument." Yes, the feed ramps on the Rosco Manufacturing Purebred .300 AAC Blackout Barrel are NiB treated.

by Hunter, Gear Expert, March 14, 2022
Customer Reviews
Helpful Positive Review 300 blk 8.2" barrel by Just some dude., Verified Owner, March 31, 2020
Roaco manufacturing has been producing quality barrels for several US companies. These private labeled barrels are in many more rifles / pistols then you could bivalve and you may already own one without knowing it. The only reason for this demand is...
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4/4 found this helpful
Helpful Positive Review Very accurate by fxh, February 9, 2019
Excellent barrel. Quality finish and good fit. This barrel is producing sub MOA groups with my reloads. Appears to like H110 powder over a 125 grain bullet best. The 1 in 7 twist has no problem stabilizing bullets sizes from 110 grains to 155 grains....
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3/3 found this helpful
Most Recent Reviews So far so good by G3 Dimitri, Verified Owner, April 19, 2025
Only have 100 rounds through it but it seems decent, would be nice if it came with 1/5 twist rate instead of 1/7. The threads were incredibly smooth. Please note the barrel only has 1 detent for gas block screws so unless you pin gas block this may n...
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Most Recent Reviews Rosco 416 stainless barrel 300 black out by Ben Short Shorty, Verified Owner, July 20, 2024
I think it looks awesome and it seems to shoots perfect. It one issue in 300 rounds
Most Recent Reviews Surprised with the Bulldog by Jaret, Verified Owner, July 28, 2022
Very accurate on my last build. Surprised for such a short barrel. Zero issues with assembly. I’ve been a Ballistic fan, but will try more Roscos in the future. If I had to find a complaint, I’d like it to come with 2 dimples instead of just 1 for...
Read More...
Read All 5 Reviews
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Product Info for Rosco Manufacturing Purebred .300 AAC Blackout Barrel

Pick up a Rosco Manufacturing Purebred .300 AAC Blackout Barrel to advance your aim and overall performance when putting shots on target. These Rifle Barrels by Rosco Manufacturing are constructed from 416R stainless steel for the toughness you need in the field. Plus, Rosco Manufacturing precision-machined these Rosco Manufacturing .300 AAC Blackout Barrels from scratch in their RI facility to ensure each one meets the highest quality standards possible. You can also be sure that all the materials and craftsmanship that go into these barrels are of the highest quality possible. The Rosco Manufacturing Purebred Heavy Profile Barrel is the perfect match for your pistol if you want a more powerful firearm.image

Specifications for Rosco Manufacturing Purebred .300 AAC Blackout Barrel:

Manufacturer: Rosco Manufacturing
Finish: 80 Grit Bead Blast
Fabric/Material: 416R Stainless Steel
Caliber: .300 AAC Blackout
Barrel Profile: Heavy
Threads per Inch: 5/8x24
Barrel Material: 416R Stainless Steel
Flutes: No
Gun Make: AR Platform
Gun Model: AR-15
Condition: New
Gas Block Journal Size-Length: 1.2 in
Country of Origin: USA
Gas System: Pistol Length

Features of Rosco Manufacturing Purebred Barrel, Heavy Profile, .300 BLK

  • Gas Block Size .750
  • Barrel Crown Step Crown

Package Contents:

  • Rosco Manufacturing Purebred Barrel, Heavy Profile, .300 BLK

Rosco Manufacturing Purebred .300 AAC Blackout Barrel Orderable Models

List of Orderable Models

Rosco Manufacturing Purebred .300 AAC Blackout Barrel, 10.5in, Pistol, Heavy, 1-7 Twist, 5/8x24 Thread, 80 Grit Bead Blast, Stainless, PB-105-HB-300BLK-7-P , MPN: PB-105-HB-300BLK-7-P , UPC: 181969500289 , Code: 3FY-ATB-985GA-PB-105-HB-300BLK-7-P
Rosco Manufacturing Purebred .300 AAC Blackout Barrel, 16in, Pistol, Heavy, 1-8 Twist, 5/8x24 Thread, 80 Grit Bead Blast, Stainless, PB-16-HB-300BLK-8-P , MPN: PB-16-HB-300BLK-8-P , UPC: 181969500296 , Code: 3FY-ATB-985GA-PB-16-HB-300BLK-8-P
Rosco Manufacturing Purebred .300 AAC Blackout Barrel, 8.2in, Pistol, Heavy, 1-7 Twist, 5/8x24 Thread, 80 Grit Bead Blast, Stainless, PB-82-HB-300BLK-7-P , MPN: PB-82-HB-300BLK-7-P , UPC: 2619682 , Code: 3FY-ATB-985GA-PB-82-HB-300BLK-7-P

Rosco Manufacturing Purebred .300 AAC Blackout Barrel Unavailable & Discontinued Models

List of Unorderable Models

DEMO, Rosco Manufacturing Purebred .300 AAC Blackout Barrel, 8.2in, Pistol, Heavy, 1-7 Twist, 5/8x24 Thread, 80 Grit Bead Blast, Stainless, PB-82-HB-300BLK-7-P , MPN: PB-82-HB-300BLK-7-P-DEMO , Code: 3FY-ATB-985GA-PB-82-HB-300BLK-7-P-DEMO
DEMO, Rosco Manufacturing Purebred .300 AAC Blackout Barrel, 10.5in, Pistol, Heavy, 1-7 Twist, 5/8x24 Thread, 80 Grit Bead Blast, Stainless, PB-105-HB-300BLK-7-P , MPN: PB-105-HB-300BLK-7-P-DEMO , Code: 3FY-ATB-985GA-PB-105-HB-300BLK-7-P-DEMO
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