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Old April 23, 2012, 08:57 AM   #49
Jim Watson
Senior Member
 
Join Date: October 25, 2001
Location: Alabama
Posts: 11,383
There have been several designs of autorifle/LMG built to fire closed bolt semi, open bolt full. The Johnson LMG did. I gather that it was concluded that the feature was not worth the mechanical complication because there was seldom a use for slow semiauto fire from a LMG. Kind of like the magazine disconnector on a 1903 Springfield, built to an obsolete doctrine of preventing dumb soldiers from "wasting ammunition."
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