A great lock for various stocks including full stock Hawken, Leman, Southern Mountain, Tennessee, and Poor Boys. It also works well with Manton, Egg, Twigg rifles, and fowling pieces. The lock is 5" x 1", has a waterproof pan roller frizzen spring, stirrup type springing and fly. Bearing surfaces on tumbler and sear, and is highly polished internally. Recommended size fling 5/8".