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Q&A for Rosco Manufacturing Purebred .300 AAC Blackout Barrel — 5 Questions & 4 Answers

Name Rosco Manufacturing Purebred .300 AAC Blackout Barrel (5)
As Low As $169.20 Save 10%
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Q
Blackout, guest, from WV, United States, asked on March 07, 2022

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
A
Answered by Hunter, Gear Expert, from OH, United States, on March 31, 2022

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.

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Q
GeeDeeBird, member, from NM, United States, asked on February 24, 2022

The description says "Nickel Boron" finish. Two questions. What, exactly is NiB treated? Is the feed ramp NiB treated?

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A
Answered by Hunter, Gear Expert, from OH, United States, on March 14, 2022

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.

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Q
qmclaws, member, from AZ, United States, asked on January 25, 2022

Can I use a Adams gas piston system on this barrel?

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A
Answered by Hunter, Gear Expert, from OH, United States, on February 14, 2022

Yes, the Rosco Manufacturing Purebred .300 AAC Blackout Barrel will work with an Adams Arms Gas piston system as long as the gas block and gas system length are compatible.

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Q
Jack, member, from AZ, United States, asked on January 08, 2019

Can you tell me the size of the actual gas port?

Expert Answer
A
Answered by Ethan C., Gear Expert, from IL, United States, on November 07, 2019

This barrel uses a .750 gas block journal. If you are looking for the size of the actual gas hole, unfortunately the manufacturer has not provided that information, even on their own site. We recommend contacting them directly, they should be able to provide you with that information. You can reach them here: https://www.roscomanufacturing.com/contact/

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Q
Joe, member, from NH, United States, asked on July 13, 2025

Does this come with a gas tube like the k9 series does?

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