Manufactured by G.P. Foster of Taunton, Massachusetts, Porter's revolving rifles showcased a number of impressive features, with the Second Type fitted with an automatic percussion primer built into the lock plate. Blade front and notch rear sights, both offset to the left to clear the turret cylinder, with the 3-line address and patent markings "ADDRESS/P.W. PORTER/NEW=YORK" and "P.W. PORTER'S/PATENT./1851." on the upper right barrel flat. The cylinder is numbered "245", with "167" on the frame, lock plate, takedown catch, primer cover, barrel and loading lever. Smooth straight wrist stock, with a lever catch on the lower tang and a smooth curved buttplate.