The Colt Monitor R80 was a rare American automatic rifle introduced in 1931 by Colt's Patent Fire Arms Manufacturing Company. It was essentially a specialized version of the Browning Automatic Rifle redesigned for law-enforcement use during the violent gangster era of the early 1930s. Chambered in .30-06 Springfield, the Monitor retained the BAR’s gas-operated automatic mechanism but was modified to be more practical as a shoulder-fired weapon: it had a shortened 18-inch barrel, a separate pistol grip, no bipod, and a large Cutts compensator at the muzzle to help control recoil during automatic fire. The rifle fired from detachable BAR magazines at roughly 500 rounds per minute and weighed about 16 pounds.
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