This is off of a Savage model 10 chambered in .223 Remington. Small shank 24 inch long threaded 1/2-28 for silencer or muzzle brake. Barrel is 9 twist and has had exactly 316 round fired through it. I bought it new back in June of this year and using the action for a different build. Will include the thread protector cap and the useless "smooth" barrel nut. Price is $150.00 shipped in the lower 48. Money order or check ok with clearance time, paypal ok but add in the fees involved.