https://www.milsurps.com/images/impo...SC358634-1.jpg
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His cover is not closed...(for you marines, I mean the one on the 1919A4...)
also has AP in the belt
From what I've been able to gather, AP was used in common issue in Korea because the bullets carried better and were more effective in knocking down enemy. They are a bit heavier...Apparently the M1s were fed a steady diet of AP. I'm not certain where I heard that so maybe others can confirm or deny...
Glad to see the rest of the troops not to fussed about sky lining themselves or it could be a ploy to get the enemy to open up then tap them with the MG !