The M197 electric cannon is a 20 mm three-barreled electric Gatling-type rotary cannon used by the United States military. == Development == The M197 electric cannon was developed primarily for use by United States Army helicopter gunships.
The M197 electric cannon is a 20 mm three-barreled electric Gatling-type rotary cannon used by the United States military. == Development == The M197 electric cannon was developed primarily for use by United States Army helicopter gunships.
Source: Wikipedia "M197 electric cannon" · CC BY-SA 4.0
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