Manufacturer: Many manufacturers, many homemade.
Years Active: 19th-20th centuries. Some sporting use in 21st.
Type: Extremely large breech-loaded shotgun.
Length: Around 10 feet long.
Bore: 50 mm or greater.
Use: Rapid harvesting of large flocks of water fowl for commercial consumption. Could kill 50 or more birds at a shot.
Ammunition: Special paper or brass cartridges. Some containing a pound of shot!
Legalilty: Not legal for hunting in the US. Bore size limited in the UK.
Trivia: The name punt comes from the flat bottomed boats these guns were often fired from.