Rosco Manufacturing K9 Sauce Pack AR-15 5.56 NATO 11.5" 1:7 BCG Bundle

The Rosco Manufacturing K9 Sauce Pack bundles a premium 11.5" 5.56 NATO barrel with the matched gas-system components needed to complete an AR-15 carbine or pistol build, all designed and tested as a single synchronized system by Rosco.

At the heart of the kit is the K9 barrel itself - a 4150 CMV steel, nitride-finished barrel chambered in 5.56x45mm NATO with a 1:7 twist and a standard 1/2"x28 thread pattern that accepts virtually any common muzzle device or flash hider.

Tuned around Rosco's proprietary patrol-length gas system - a middle ground between carbine and mid-length engineered to deliver smoother cycling than a carbine-length system and greater reliability than mid-length - the K9 11.5" is built to run reliably on short-platform builds.

Rounding out the bundle is a Bloodline Bolt Carrier Group (compatible with both 5.56 NATO and .300 Blackout), a non-adjustable gas block, and a gas tube. Because every part comes from the same manufacturer and is gas-system matched, the kit drops into a stripped upper with the bolt, gas port, and barrel ready to function together right out of the box.