Quote:
Originally Posted by stugumby
Primary cause of mg stoppages is failure to extract,then failure to feed. M2 50 cal is known to heat up and rip the rim off the cartridge case, bolt goes back case gets rim ripped away and fails to extract. Next cartridge is already removed from link and gets shoved into hole from previous casing stuck in chamber. Now fails to feed,you can try to recharge but not gonna work since rimless brass can't be extracted. Will need ruptured casing tool and remove barell to fix.
M2 fires from a closed not open bolt.
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The main concerns with prolonged bursts aren't barrel damage (although dumping the entire belt isn't great for the barrel), it's runaway guns in closed-bolt weapons like the M2. The chamber heats up enough that when the next cartridge is fed into place, it overheats and fires without the hammer dropping, which cycles the weapon and causes another round to feed, which fires... you get the idea.
The Korean-era P-51 pilots manual explains burst lengths and runaway gun heat issues.
10-04-2014, 11:37 PM
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