What are the Ketland lock mortise dimensions on a Southern Mountain Rifle Kit?The Ketland lock mortise on a Southern Mountain Rifle Kit is 4.775 by 0.908 inch. Category: Product SpecLast verified: 2026-07-25Also called: gun, rifle, muzzleloader, muzzle loader, firearm, southern mountain, SMR, poor boy, lock, flintlock, firing mechanism, building, assembly, putting together, finishing More in Frequently Asked Questions