T-Box 5.56 NATO Match Grade Barrel


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The 5.56 NATO Chamber is a cartridge that has been adopted my the US Military and most US Law Enforcement Agencies. It has proven itself time and time again as a formidable battle cartridge. The 556 NATO chamber is also an excellent choice for economical weekend shooting as it will generally cycle most all commercial loads. This chamber will safely fire both the .223 Remington and the 5.56 NATO.

Always chambered and head-spaced by hand to SAAMI specifications when applicable. Our barrels are designed to be sub-MOA tack drivers when used in conjunction with match ammo and quality components.

Matched Bolt:
(Place one in your cart and it will be matched to your barrel)

The T-Box Matched Bolt will provide you with a barrel that is headspaced to a specific bolt for the ultimate in Repeatability potential. This price includes custom headspacing and a QPQ (Melonite) treated bolt.

Additional information

Weight 2.3 lbs
Dimensions 24 x 2 x 2 in

1:7, 1:8

Gas Block Size

.750, .875


416 SS


16, 18, 20



Gas System Length

Mid, Rifle

1 review for T-Box 5.56 NATO Match Grade Barrel

  1. Jay Heine

    I have shot just about every high end barrel that’s on the market. The barrels that I have gotten from tbox are hands down the best barrels I have ever shot on an AR platform. With the resalts I have gotten from these barrels I couldn’t be payed by other company’s to shoot there barrels. These are the best and if you are serious about shooting and accuracy you want a barrel from tbox. Very easy to work with and they always take the time to get back to you with any questions you have and that’s really hard to find now days. You will only see tbox barrels on all my rifles! Thank you Seth and Brandon for putting the time into making such a great product and not just mass producing your barrels!

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