In the years between the World Wars, a rare variation of the Browning Automatic Rifle proved its reputation as an effective, devastating automatic rifle for combat between the country's lawmen.. While Colt made few of the guns themselves, both the 8mm Mauser-chambered Polish Browning (Fabryka Karabinów) wz. 1928 and the Belgian FN Model 1930 light machine guns owed at least some.
This absolutely fantastic Colt Monitor was formerly in the personal collection of James Lester Ballou, author of the noted book on the Browning Automatic Rifle A Rock and A Hard Place . Marked on top of receiver "Colt Automatic Machine Rifle / Model 1919-Cal. 30" with Browning patent and Colt manufacturing address as well as SN.. The Colt Monitor automatic rifle was introduced in early 1931 for law enforcement customers. Based on the Browning Automatic Rifle (BAR) adopted for U.S. military service in 1918, it was modified for use with police and security forces—hence the 'Monitor' moniker.