Your Browser is OutdatedAR-15 Barrels | Fluted & Threaded Barrels from Faxon Firearms, Ballistic Advantage, Criterion Barrels & Other Top Brands — 620 products / 1,574 models — Page 1
Shop online for great deals on fluted and threaded AR15 barrels. Available in a wide variety of twist rates and threads per inch (TPI), we offer a wide selection of AR15 barrels and rifle barrels that will improve your accuracy and performance when putting shots on target. We have stainless steel barrels chambered in tons of the most popular calibers, including 300 Blackout barrels, 6mm Arc barrels, and 338 Arc barrels. Plus, we offer multiple barrel profiles like hybrid, contour, and multi-role so that you can get the perfect AR barrel for your needs. Upgrade to a new Faxon barrel, Ballistic Advantage barrel, Proof Research barrel, or other premium AR15 barrel from top gun part brands.
What Is the Best Barrel Size for an AR-15?
Most shooters recommend a 20in barrel for your AR platform because it provides high accuracy and velocity without weighing you down too much. However, a 20-inch AR15 barrel can be too long for many tactical operations, which is why the standard length is 16 inches. If you're looking to replace the barrel for a 9mm AR pistol, you can even go a lot shorter with barrels ranging between 6 and 11 inches.
What Barrel Length is Legal on an AR-15?
As of 2025, an AR must have a barrel of at least 16 inches to qualify as a rifle. Barrels under 16 inches will classify the gun as a short-barrel rifle (SBR). SBRs are regulated under the National Firearm Act and require an NFA tax stamp and a BATFE application for approval. These regulations are rapidly changing in today’s climate, so please check your local and state laws before purchasing an AR barrel for your weapon.
Buy AR-15 Barrels Online at OpticsPlanet
Get great deals on a brand new AR15 barrel or on other AR 15 parts like gas blocks and handguards for your AR platform. If you need assistance while browsing the thousands of products on our website or top-rated mobile app, read our Rifle Barrel Types & Materials guide to learn more about CMV barrels, twist rates, and what type of profile barrel is best for you. Plus, we offer Free Shipping on most orders over $49!
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