K9 12.5″ Sage Dynamics 5.56 NATO
From: $170.00 $153.00 Select options
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K9 12.5″ Sage Dynamics 5.56 NATO

From: $153.00

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 with improved harmonics, fit and finish. We recommend a minimum handguard length of 10″ with this barrel.

NOTE: COMES WITH PATROL LENGTH GAS TUBE

(9 customer reviews)

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. These Adjustable gas blocks pick 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.

In stock

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 with improved harmonics, fit and finish. We recommend a minimum handguard length of 10″ with this barrel.

NOTE: COMES WITH PATROL LENGTH GAS TUBE

Barrel Length 12.5″
Barrel Weight 27.05 oz
Barrel Material 416R
Barrel Caliber 5.56
Barrel Profile

Continuous

Twist

1/7

Barrel Thread

1/2 x 28

Barrel Gas Block Size

0.750

Gas System Length

Patrol
Barrel Crown

11 Degree

Barrel Finish

Nitride

Barrel Extension Finish

Nitride

Additional information

Weight 2 lbs
Dimensions 19.5 × 2.3 × 2.2 in

9 reviews for K9 12.5″ Sage Dynamics 5.56 NATO

  1. Casey (verified owner)

    Received the barrel after it looks like it was dropped, damaging the threads and rendering them useless. This was purchased directly from Rosco and provided pictures of the damage. Unfortunately I’ll be out of town for months and won’t be able to return the damaged barre and Rosco won’t replace it unless they get the old barrel back. First and last purchase of Rosco products for me.

  2. Devin

    Received my barrel and it looks great. The tapered profile is sweet and packaging is excellent as always! Can’t wait to shoot it. Have purchased many Rosco products and have never been disappointed. I’ve dealt with customer service once due to needing help with a used part I got from a friend and they responded to me and got me squared away on the same day I emailed. Great company all around!

  3. Michael Yarbrough (verified owner)

    My first rosco barrel and I’m impressed. The taper is good and barrel is dimpled for the gas block set screw. It’s run flawless and I’m waiting to stretch its legs at distance to see how it groups.

  4. Andy (verified owner)

    This is probably my favorite barrel setup so far. I was running a 10.3 mk18 suppressed for my home defense gun, decided to try this, with there gas block I Put 500 rounds of mixed ammo thru it, including steel case, ran perfect, no malfunctions, soft shooting including suppressed. Under 1 moa at my 100 yard zero. Great packaging. Thanks ROSCO

  5. Chris

    My first rosco for my first complete build. I’m impressed with the quality and accuracy you get for the price. This barrel can outshoot me! Few hundred rounds of brass and steel and 2moa was the best I could do but I know the barrel could do better.

  6. Erik (verified owner)

    Just put this barrel in my new build and zero’ed it…I tried a few different types of ammunition and noticed my group definitely got tighter when I used 62g and even Hornady 75g. Easily getting 1 MOA. Waiting on a suppressor to see how well the new gas length works. Definitely recommend, also you can’t beat the price for the performance you’re getting!

  7. Nick (verified owner)

    Great product. Excellent workmanship. Looking forward to the new gas length.

  8. Tyler Nixon (verified owner)

    Picked this up the very second they went up on the website! I’ve had it now for a while and have been incredibly impressed with its performance. I have taken it as my personal mission to test as many 12.5” barrels out on the market…. Ranging from a few of the rosco bloodlines carbine lengths to a few other options like chf chrome lined “exc” length systems and some other patented rifling technology barrels with mid length gas systems. And some heavy fluted Rainer mid lengths etc. so far….. THIS barrel out performs them all!! Accuracy is incredible. I typically shoot reloads from 69gr up to 77gr and this barrel is absolutely perfect. The recoil impulse with vltor A5h2 buffer and sprinco green spring (I also use a Tubbs flat wire) is awesome. Super flat shooting settles down for follow up shots quickly and I think that may be the balance of the taper mixed with a good setup. I’m currently running a Rex silentium mg7k .224 bore can on this barrel and it’s amazing. Would 100% suggest this barrel to a friend. I also make sure my buddies shoot my newest gear for their insight and they all agree this one is on top of the dog pile! Thanks to Aaron at sage and the people at rosco for putting this one together!

  9. David (verified owner)

    Awesome barrel perfectly gassed and shoots sub moa 556 62 grain at 100 yards recoil the quality fit and finish is superb and well balance and I have to say I also appreciate the dimple.

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