Take off from my new brother's AR10. Honestly has less than 100rds through it.From Armalite's web site.
AR-10A4 16" Carbine Chrome Lined RH 1:11.25 twist threaded barrel.
Two port recoil check, phosphate finish, threaded for the .308 only.
The barrel is still mounted on his rifle so getting pictures of it isn't practical right now.
Comes with factory gas block, gas tube, factory flash hider. No barrel nut or delta ring included.