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.
All T-Box Barrels now come with a Matched T-Box Brand Bolt.
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 includes custom headspacing and a QPQ (Melonite) treated bolt.