By about the year 1853 Tranter had manufactured over 8000 Adams double-action revolvers under licence. Together with James Kerr, Tranter developed modifications to the Adams action and about 1853 he made the first of his double trigger, double-action revolvers. The first model was built on an Adams frame and featured a detachable rammer which fitted onto the frame. His next model featured a rammer secured by a keyed peg on the frame and a hook on the barrel. In 1855 he also manufactured his own version of the Beaumont–Adams revolver, known as the Tranter-Adams-Kerr.