Purebred 10.5″ 300 Blackout Barrel

From: $200.00

This Rosco Purebred 10.5″ 300 Blackout Barrel was designed for SBR/ Pistol use in conjunction with suppressors. The 10.5” Rosco barrel was made to be a direct precision replacement for any MK 18 platforms that are currently in 5.56 NATO. The 10.5” barrel is also perfect for carbines which require a slightly longer rail in order to run PEQ-15’s, D-BAL (series), or any laser aiming devices comfortably. ALL NFA RULES APPLY!

(1 customer review)

Melonite Gas Tubes

Our Rosco Melonite Gas Tubes have an extremely durable Black Nitride finish that increases corrosion resistance, wear resistance, fatigue strength and cosmetic appeal. These gas tubes work great under a handguard because they are more durable than standard gas tubes. Available in pistol, carbine, mid-length, and rifle lengths. Does not include a roll pin.

Non-Adjustable Gas Block

Our Rosco Non-Adjustable Gas Blocks are purposely designed to be lined up perfectly with our barrels and gas ports to ensure reliable cycling every time. We have created two options for the end user; Our Non-Adjustable gas block is a direct plug in for any one of our barrels and has provisions for pinning, our Adjustable block picks up where our standard block leaves off and works perfectly for shooters that want to be able to control their gas flow for suppressed applications.

Adjustable Gas Block

Our Rosco Adjustable Gas Block is purposely designed to be lined up perfectly with our barrels and gas ports to ensure reliable cycling every time. We have created two options for the end user; Our Non-Adjustable block is a direct plug in for any one of our barrels and has provisions for pinning, our Adjustable gas block picks up where our standard block leaves off and works perfectly for shooters that want to be able to control their gas flow for suppressed applications.

Out of stock

Purebred 10.5″ 300 Blackout Barrel: This Rosco Purebred 10.5″ 300 Blackout Barrel was designed for SBR/ Pistol use in conjunction with suppressors. The 10.5” Rosco barrel was made to be a direct precision replacement for any MK 18 platforms that are currently in 5.56 NATO. The 10.5” barrel is also perfect for carbines which require a slightly longer rail in order to run PEQ-15’s, D-BAL (series), or any laser aiming devices comfortably. ALL NFA RULES APPLY!

Rosco Manufacturing’s “Purebred” series is a testament to precision and quality manufacturing. We took a step back to see how we could create a barrel line that would be a culmination of all the lessons learned through years of making barrels for several OEM’s. The result is a barrel that will produce results out of the box for any shooter that is looking to take their skills above and beyond. All of our Purebred barrels are made from scratch in our Rhode Island facility and start life as a blank piece of 416R stainless steel.

Aside from making our own barrel blanks, and barrel extensions, we also hold ourselves to the most stringent quality standards. This is the only way that we can make sure that we are producing a product that will perform time after time under the demanding of situations. We are setting out to re-define the rules and we plan on letting our work do the talking…

 

Barrel Length 10.5″
Barrel Weight 21.09 oz
Barrel Material 416 R
Barrel Caliber 300 BLK
Barrel Profile

Heavy

Twist

1/7

Barrel Thread

5/8 x 24

Barrel Gas Block Size

0.750

Gas System Length

Pistol
Barrel Crown

Step Crown

Barrel Finish

80 Grit Bead Blast

Barrel Extension Finish

Nickel Boron

Browse all of our Purebred Blackout Barrels >>

Additional information

Weight 1.5 lbs
Dimensions 19.5 × 2.3 × 2.2 in

Melonite Gas Tubes

Weight .2 lbs
Dimensions 9 × 1 × 1 in
Length

Pistol Length

Non-Adjustable Gas Block

Weight 0.153125 lbs
Dimensions 1.5 × 1.5 × 4 in

Adjustable Gas Block

Weight 0.1625 lbs
Dimensions 1.5 × 1.5 × 4 in

1 review for Purebred 10.5″ 300 Blackout Barrel

  1. jprogers22 (verified owner)

    Happened to hear a good word about Roscoe Barrels watching a Garand Thumb video. Checked out what you had . . . and this seemed to fit the bill. After 9 months of gestation – putting it all together – I finally took her out. Your 10.5″ barrel and gas tube, nestled in an aero upper with BCM BCG. All initial runs done at 50 yards on a 20-degree day. The 5-shot groups are all within the first 100 rounds fired. Absolutely loves Sig Sauer Elite (220 gr subs and 125 supers) with groups of 0.625″. POI different of course, but same size groups. WInchester XP 150 gr and Fiocchi 150 gr FMJBT came in together as a close second with 0.75″ groups. Suspect groups will tighten over time . . . and when I am shivering a little less. For brush work and in-home-defense, this is more than acceptable. Definitely will be going with Rosco on future builds.

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