This North American Arms revolver is chambered in .45 Winchester Magnum and sports an 8 inch barrel. This was made during the Spanish Fork, UT days when NAA collaberated and/or were inspired by Dick Casul and they are extremely rare and are of very high quality. This revolver is single-action.  NAA focuses entirely on mini revolvers now but these full size revolvers are prized by both collectors and outdoorsmen. The firearm comes with 2 boxes of .45 Win Mag ammo. 
This is single-action.