Re: M2 carbine won't run
Yes they need to be timed. There is a couple of good milspec videos on the operation of the M2 on youtube. Its the original briefing videos presented to the military in the 1930s so they are in B&W and sound is very analog. But they are quite informative.
It takes 43 muscles to frown, 17 to smile, and 3 for proper trigger squeeze.
The latest caliber or gear is no substitute for experience and skill. Rifles and cartridges don't make hits -- shooters do.
Fact of life:
After Monday and Tuesday, even the calendar says WTF!