This never fired 400 Legend barrel was removed from a Mossberg Patriot bolt action rifle. It has short shank 11/16” - 40 TPI and will also fit Savage type short action rifle. Barrel has a few blemishes from wrestling it off. Has threaded muzzle with protector and 1:16” twist. If you go with a replacement Savage barrel nut, I will include the barrel nut wrench. In case you are wondering, I replaced the barrel with a 6.8 spc from ARP/Blackstone. Thanks