Daniel Defense's DD 12.5" government-profile carbine barrel with fixed front sight base is the clone builder's answer to the short-barreled M4-pattern rifle — Mk 18-adjacent length, correct M4 contour, and the FSB geometry that pins the gas block at the correct dimension for a carbine-length gas system.
Daniel Defense cold-hammer forges this barrel from 4150 chrome-moly-vanadium steel, then finishes it with mil-spec heavy phosphate externally and chrome lines the bore and chamber. That is the same process that puts DD barrels on U.S. military contracts, and it is why these barrels easily exceed the expected service life of a standard chrome-lined bore.
Chambered in 5.56 NATO with a 1:7 twist, the barrel stabilizes everything from 55-grain M193 to 77-grain OTM match. The pinned front sight base is in the correct carbine-length position, ready for an A2 FSB assembly or mil-spec front sight tower. Pair it with a DD bolt carrier group and a clone-correct upper to finish an Mk 18-style short-barrel build.
If you build M4 clones, this is the barrel you specify. Order yours today and build it right.
Daniel Defense
Daniel Defense