Lang revolvers are of the "transitional" type; that is, the frame is similar to that of a Pepperbox revolver, but utilizing a conventional barrel and cylinder. Lang revolvers were single-action, and made from steel and silver. Some models had fluted cylinders whereas others had smooth cylinders. The hammers of Lang revolvers had three bents; safety, half-cocked and full-cocked.
Lang revolvers can be identified by markings on the barrel, reading J. LANG, 22 COCKSPUR ST., LONDON.