The large parts diagram is from a WW2 era manual put out by General Motors. The parts blow-ups below it are from a 1944 armorer's manual for the M2 aircraft. Click on any image for the larger image. More information on the M2 aircraft can be found on my aircraft gunnery Web site, or by clicking HERE.
You can enlarge this by clicking on the image. It's a fairly large file
because the original is a three page fold-out and I wanted you to get the details.
COVER GROUP
RECEIVER GROUP
BARREL GROUP
OIL BUFFER GROUP
BACK PLATE GROUP
BOLT GROUP
RETRACTING SLIDE GROUP
OPERATING SLIDE GROUP
