I have a 2 new .243Win carbon fiber Proof drop-ins for anything with a small shank Savage threading. Just use a barrel nut. 26" straight taper down to .960" at the muzzle. 1:8" twist. The muzzle is not threaded but there's plenty of stainless there should you want it to be so. $525 shipped insured to the lower 48 per barrel. Thanks