It is a custom .50 caliber in the southern mountain rifle style made by Bob Gass in 2011. The barrel is a 42" straight octagon measuring 7/8" across the flats. It is iron mounted and all parts are browned. The trigger is a double set, and the length of pull to the forward trigger is 13.75". Neither the lock nor the barrel have any markings. I think it has had on the order of 100 rounds through it since it was new. The stock has some figure in the butt area, but is otherwise plain with no fancy engraving or inlays. It does have a raised cheek piece. Maybe someone has an idea who made the lock? I know the pics aren't that great....