Rosco 12.5" 5.56mm K9 Barrel

Your Price: $169.00
Retail Price:$170.00
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Out of Stock.
Part Number:ROSCO-12.5-K9

This 12.5” Rosco barrel is the first in the K9 series of barrels, developed in conjunction with Sage Dynamics.  Featuring a nitride finished 416R stainless steel material, this barrel also features the new "Patrol" length gas system (matching gas tube included), bridging the gap between a Carbine and Mid Length setup.  The tapered profile adds thermal mass around the chamber (where the most heat is generated), while removing mass from the front to help balance out the added weight of lights, suppressors, and accessories.

Rosco 5.56 (NATO) barrels are designed to meet the modern day carbine shooters requirements. From properly managed dwell times for SBR’s, to running Suppressed, or setting up a balanced patrol carbine they have incorporated the needs of demanding shooters into their engineering. 

K9 barrels are nitride treated 416R steel, with true 5.56mm chambers, gassed for versatile performance with both high and low pressure ammo.  If you're looking for a gun that runs hard but still shoots great, checkout what Rosco means by #affordableaccuracy

Please note, we do have a number of available upgrades and services to offer with these barrels, and more information can be found about them under the SERVICES section of our website, listed at the top/header of the page. 

Barrel Length12.5"
Barrel Weight1lb 11oz
Barrel Material416R
Barrel Caliber5.56
Barrel Profile




Barrel Threads

1/2 x 28

Gas Block Size


Gas System Length

"Patrol" Length, *gas tube included*
Barrel Crown

11 Degree

Barrel Finish


Barrel Extension Finish


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