FREE SHIPPING & FREE RETURNS*

FREE SHIPPING on Over 250,000 Products

Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC, and to all U.S. Military APO/FPO/DPO addresses.

Enjoy our FREE RETURNS

We want to ensure that making a return is as easy and hassle-free as possible! If for any reason you are not satisfied with your purchase, simply return the item within 30 days of receipt, and we'll cover the cost of return shipping. Learn more about our Return Policy.

Shopping Cart
Government Export Restriction Government Export Restriction
Government Restriction Government Restriction
Questions & Answers
What length gas tube is used for the patrol length system? Expert Answer

The Rosco Manufacturing K9 Sage Dynamics Rifle Barrel with a patrol length gas system includes the patrol length gas tube required. It is a proprietary gas length not commonly used by other manufacturers. It is designed to be smoother than a carbine length system and more reliable than a mid-length system.

by Ethan, Gear Expert, January 11, 2023
Does tube come with roll pin Expert Answer

The Rosco Manufacturing K9 Sage Dynamics Rifle Barrel does not come with a roll pin.

by Hunter, Gear Expert, December 8, 2022
Customer Reviews
Helpful Positive Review Initial inspection and assembly, very impressive. by Mike, Verified Owner, January 19, 2024
If it shoots as pretty as it looks, I will 5 star this barrel. Feels very balanced. Can't shoot gun as recovering from surgery.
1/3 found this helpful
Most Recent Reviews Great Barrel by Olowrin, Verified Owner, November 18, 2023
Great Barrel used in many full builds you can buy off the shelf. Highly recommend for the dependability
0/2 found this helpful
Most Recent Reviews Rosco makes great barrels by YS, Verified Owner, January 31, 2024
Rosco makes great barrels. I have several. This K9 profile helps improve balance by moving the center of gravity from the muzzle toward the receiver. Can't go wrong here with their reputation and good price
0/1 found this helpful
Most Recent Reviews Rosco Barrel by David Anzalone, March 30, 2024
Im still putting together my first build, But the Rosco Barrel looks like Quality.Im really excited to finish. Im sure I wont be disappointed with the barrel.
0/2 found this helpful
Most Recent Reviews So far so good by jdmosee, Verified Owner, September 19, 2024
Just got it in and put it together. Can't wait to get it to the range. 1st impressions are great. Looks great and the reviews are great.
0/2 found this helpful
Read All 5 Reviews

We've got an AWESOME deal for you!

Blazin' Deal
Prices have been cut drastically on this product as part of a special offer. These prices are so low that there's no double-dipping with coupons or any additional discounts, but you'll still get the best deal out there. This offer won't last long, so don't miss out!
Finish: Nitride Barrel Length: 12.5 inBarrel Profile: Contour Gas System Length: Patrol Gas Block Journal Size-Diameter: .750 inThreads per Inch: 1/2x28 Barrel Twist Rate: 1-7 Barrel Material: 416R Stainless Steel Weight: 27 ozGas Block Journal Size-Length: 0.750 in

Code: 3FY-ATB-K9UJK-K9-125-HY-SAGE-556-7-PT

MPN: K9-125-HY-SAGE-556-7-PT

UPC: 850039693069

Blazin' Deal
List: $190.00Save 13%
$165.02

Buy Together and Save

made-in-usa-flag Made in USA

Help support American manufacturing! Marked models of this product have gone through rigorous review and been certified by the manufacturer as Made in the USA.

Product Info for Rosco Manufacturing K9 Sage Dynamics Rifle Barrel

The K9 12.5 offers a proprietary patrol length gas system that is smoother than carbine length, more reliable than mid-length. Features an optimized gas port to run reliably suppressed and/or unsuppressed. The K9 continuous taper is the most effective profile to dissipate heat from hard use. With weight shifted to the back of the barrel, modern attachments on the front of the rifle create a perfectly balanced and better handling rifle. Updated target crown carried over from the Purebred series. Features no 90 degree cuts, improved harmonics, fit and finish.image

NOTE: COMES WITH PATROL LENGTH GAS TUBE

Specifications for Rosco Manufacturing K9 Sage Dynamics Rifle Barrel:

Manufacturer: Rosco Manufacturing
Finish: Nitride
Barrel Length: 12.5 in
Barrel Profile: Contour
Gas System Length: Patrol
Gas Block Journal Size-Diameter: .750 in
Threads per Inch: 1/2x28
Barrel Twist Rate: 1-7
Barrel Material: 416R Stainless Steel
Weight: 27 oz
Gas Block Journal Size-Length: 0.750 in
Country of Origin: USA

Features of Rosco Manufacturing K9 Sage Dynamics Rifle Barrel

  • 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.

Package Contents:

  • Rosco Manufacturing K9 Sage Dynamics Rifle Barrel
  • Patrol Length Gas Tube

Rosco Manufacturing K9 Sage Dynamics Rifle Barrel Orderable Models

List of Orderable Models

Rosco Manufacturing K9 Sage Dynamics Rifle Barrel, 5.56, 1-7 Twist, 12.5in, 1/2 x 28 Thread, Black Nitire, K9-125-HY-SAGE-556-7-PT , MPN: K9-125-HY-SAGE-556-7-PT , UPC: 850039693069 , Code: 3FY-ATB-K9UJK-K9-125-HY-SAGE-556-7-PT
Compare (0)