PROOF Research Accuracy International Pre-Fit Carbon Fiber Barrel, 308 Win, 16.5, 1:10 TwistThis PROOF Research carbon fiber pre-fit barrel is made for Accuracy International short-action rifles.This barrel is PROOF Research part number 109298: 308 Win, 16.5 long with a 1:10 twist, in carbon fiber.Upgrade your build with this PROOF Research 308 Win barrel.Key FeaturesFrom PROOF Research: Pre-fit for Accuracy International AX308/AT/AW/AE short action; M27 breech thread; Up to 64% lighter than a steel barrel of similar contour; Improved heat dissipation for cooler, longer-lasting barrels; Threaded 5/8-24.A carbon PROOF barrel is one of the most popular upgrades for AI rifles, cutting front-end weight while holding accuracy as the barrel heats up.Built by PROOF ResearchPROOF's carbon fiber barrels wrap a match-grade stainless steel core in aerospace-grade carbon fiber and a proprietary resin. That combination can save up to 64% of the weight of a steel barrel with a similar contour while keeping the stiffness that accuracy depends on.PROOF manufactures its barrels in Columbia Falls, Montana and holds them to tight bore and groove tolerances. Better heat management means the barrel cools faster between strings, which helps keep point of impact steady and can extend barrel life.Choosing 308 Win at 16.5The 16.5 length and 1:10 twist were chosen by PROOF for 308 Win. Match your bullet weight to the twist rate and you will get the stability long-range shooting needs.Before you buy, confirm that this exact fit, caliber and length are right for your action and your intended use. Barrels are specific to action type and length.Who This Barrel Is ForThis barrel is a good fit for shooters who want to upgrade a factory rifle, build a custom rig, or swap calibers on an action they already trust. Hunters like the weight savings for long days in steep country, and competitors value the consistency as the barrel heats through a stage.If you are planning a 308 Win build, think about the whole system: action, stock or chassis, trigger, optic and ammunition. A premium barrel delivers its best results when it is paired with good bedding, a crisp trigger and quality ammunition.Talk with your gunsmith about muzzle devices, suppressor plans and final length before work begins, so the finished rifle balances the way you want and meets the rules for your state.Care and Barrel LifeClean the bore with a quality one-piece rod and a bore guide, and avoid aggressive abrasives that can wear the rifling. Carbon fiber exteriors only need a wipe with a soft cloth; keep strong solvents off the finish.Barrel life depends on the cartridge, the load and how hot you run the barrel. Letting it cool between strings, keeping the throat clean and tracking your round count will help you get the most accurate service life out of it.InstallationHave a qualified gunsmith install or chamber the barrel if you are not experienced with barrel work. Pre-fit and drop-in barrels still need proper torque and a headspace check with go and no-go gauges before firing. Always follow the instructions included with the barrel and your action maker's guidance.After installation, clean the bore, follow a sensible break-in routine and confirm zero before taking the rifle afield or to a match.Buying From UsA barrel is a part, not a firearm, so no FFL transfer is needed; it ships directly to you where local law allows. Browse more rifle barrels or see all PROOF Research products.Product SpecificationsManufacturer: PROOF ResearchPart Number: 109298UPC: 843068109298Caliber: 308 WinType: Accuracy International Pre-Fit barrelMaterial: Carbon Fiber (carbon fiber wrapped, match grade stainless core)Barrel Length: 16.5Twist Rate: 1:10Muzzle Thread: 5/8-24Breech Thread: M27Barrel Weight: 2lbs-7ozFFL Required: NoFrequently Asked QuestionsWhat caliber is this barrel?It is a 308 Win barrel, 16.5 long, with a 1:10 twist.Do I need an FFL to buy this barrel?No. A barrel is not a firearm under federal law, so it ships directly to you. Check your state and local laws.What does it fit?It is made for Accuracy International rifles. Confirm your action model before ordering.Is it chambered?It is supplied ready to install; confirm headspace before firing.What is it made of?Carbon Fiber wrapped over a match-grade stainless steel core.Order your PROOF Research barrel from BattleHawk Armory today.