--- title: "Rosco Manufacturing 300 BLK Heavy Barrel 10.5\"" description: "New 10.5\" heavy barrel for 300 Blackout SBR and pistol builds. Black finish, 5/8x24 threading, and a design intended for suppressor use." canonical_url: "https://www.kygunco.com/product/rosco-manufacturing-bloodline-heavy-barrel-300blk-10.5-black-5-8x24" meta: author: KYGUNCO "og:description": "New 10.5\" heavy barrel for 300 Blackout SBR and pistol builds. Black finish, 5/8x24 threading, and a design intended for suppressor use." "og:image": "https://cdn.kygunco.com/assets/products/272440/thumbnail.jpg?v=1733337437" "og:image:height": "500" "og:image:width": "500" "og:title": "Rosco Manufacturing 300 BLK Heavy Barrel 10.5\"" --- > Index of every page on this site: [llms.txt](https://www.kygunco.com/llms.txt) [Home](https://www.kygunco.com/) / [Shooting](https://www.kygunco.com/category/shooting) / [Gun Parts](https://www.kygunco.com/category/shooting/gun-parts) / [Handgun & Rifle Parts](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts) / [Rifle Parts](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts/rifle-parts) / [Rifle Barrels](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts/rifle-parts/rifle-barrels) / RSC-BL-105-HB-300BLK-7-P ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/272440/main.jpg?v=1733337437) For illustration purposes only, this image may not be an exact representation of the product. # ROSCO MANUFACTURING Bloodline Heavy Barrel 300BLK 10.5" Black 5/8x24 The Rosco Manufacturing Bloodline is a 10.5" heavy barrel chambered in 300 Blackout, finished in black with 5/8x24 muzzle threading. It is designed for SBR and pistol use with suppressors and supports both subsonic and supersonic 300 Blackout ammunition. All NFA rules apply. $157.50 ** 5 interest-free payments of **$31.50** with ![Sezzle logo](https://www.kygunco.com/brands/sezzle.svg) ** Online In Store ** Flat Rate $13.94 for every 25 lbs. Shipping to HI & AK may incur additional fees. ** Ships To Your Home Handled by our expert shippers in Bardstown, KY. Item # 272440 Style RSC-BL-105-HB-300BLK-7-P UPC 181969500128 Condition New Manufacturer [Rosco Manufacturing](https://www.kygunco.com/brand/rosco-manufacturing) Weight 4 lb This Rosco 10.5" 300 Blackout barrel was designed for SBR and Pistol use in conjunction with suppressors. The 10.5" 300 Blackout Rosco barrel was made to be a direct 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 300 Blackout barrels were created by using input from SOCOM end users and some of the original creators of this caliber. Every barrel was designed to optimize the original role for the 300 Blackout; to be suppressor friendly and accurate. It is the goal to get you the performance that you seek out of these AR15 barrels when running sub-sonic ammo or supersonic ammo (depending on barrel length). Twist rates, gas port diameters, and lengths have all been taken into account when Rosco set out to make these. Let's just say that Rosco doesn't like leaving things to chance. Shop with KYGUNCO for the best selection, competitive pricing, and exceptional customer service. Experience the difference that comes with buying from a trusted outdoor retailer with over 20 years of experience in the industry. ** WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to [www.p65warnings.ca.gov](https://www.p65warnings.ca.gov). 0.0 ** ** ** ** ** 0 reviews ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ## More from Rosco Manufacturing ```json {"@context":"https://schema.org","@graph":[{"@id":"https://www.kygunco.com/#website","@type":"WebSite","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","name":"KYGUNCO","url":"https://www.kygunco.com/","publisher":{"@id":"https://www.kygunco.com/#/schema/organization/kygunco"}},{"@id":"https://www.kygunco.com/product/rosco-manufacturing-bloodline-heavy-barrel-300blk-10.5-black-5-8x24#webpage","@type":"WebPage","description":"New 10.5\" heavy barrel for 300 Blackout SBR and pistol builds. 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