XM-556 microgun. 4000 rpm max rate. Total length = 22"
https://www.youtube.com/watch?v=BRO5W7uxZfw
http://www.emptyshell.us/xm556-microgun/
https://www.youtube.com/watch?v=BRO5W7uxZfw
http://www.emptyshell.us/xm556-microgun/
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