Originally Posted by stenger
I just called kreiger barrels and they said min was .562 for a 30 cal barrel.
Lilja says .525 for a 30 cal, But that is the minimum muzzle diameter not the minimum wall after threading.
Lilja will not flute a barrel with less than there #4 contour (.650 at the muzzle) I recommended .648
at the muzzle in order to thread for a muzzle brake
There #5 contour (.700 minimum for fluting) will work up to .350 Cal. (I recommended .690).
There #6 contour (.750 Minimum for fluting) will work up to .416 Cal. ( I recommended .756).
Again these are minimum barrel wall diameters!!!
J E CUSTOM