Thread: 45acp subgun?
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Old October 27, 2010, 10:29 AM   #14
Mike Irwin
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Join Date: April 13, 2000
Location: Northern Virginia
Posts: 36,320
"The reason for an open bolt is for cooling."

Yep. With an automatic weapon you can heat the action up quickly enough to cook off rounds, and the firing from an open bolt helps prevent that.

There have been numerous full/semi autos over the years (primarily ones that fire rifle cartridges) that fire from an open bolt during automatic fire, but when switched to semi-automatic mode fire from a closed bolt.

The Johnson Light Machine gun comes immediately to mind.
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