Air-O-Matic (top loader, knob variant)
Courtesy of Leonardj.
The gun is designed to shoot 3/16" dia. steel balls, and was loaded by means of a cardboard tube, which held 20 shots. The tube was slid into the loading port of the open breech, and a long probe attached to the top cover would then push the balls into the magazine of the gun as the cover was closed. A protrusion on the magazine follower would block the mechanism after the last ball was shot, to avoid wasting air.
ABT Air-O-Matic repeater 1932 (David Swan collection)
With thanks to Rod Meek of Anderson & Garland Auctioneers (www.andersonandgarland.com) for permission to post these pics of a gun auctioned in 2015.
"An ABT Air-O-Matic fairground repeating rifle, US patent no. 1854605, April 19th 1932, with sliding action and chrome trigger, 41 1/2in. long overall."
Hammer price: £120