My 1943 IBM mixmaster

[emmagee1917]

The book says that too tight of a headspace can cause the doubling ( a factor because of the rebarrel ) , but again , not just on the last rounds. Most stuff stays the same through the cycling of the eight rounds . The components of the feed / clip latch / slide hold open / area change geometry during the feeding. Look there for any bent parts or abnormal wear patterns that could be binding things up to a point where the bolt / slide movement or speed is affected . Other than that , I , too , am stumped .
Chris

[ABPOS]

Brit-Tex,
Best to ask about your M1 on our Garand forum.

But wanted to ask;
Did your IBM have a scope mounted on it at one time?
Looks as though it may have been tapped for one on the left side of the receiver... per your picture

Charlie-Painter777

Good catch. I didn't notice that.

[Brit-Tex]

That's what it looks like. Only the one hole. It had a late style adjustable rear sight when I got it. It also had a Postal Meter stock with an odd "SAFE FIRE" with direction arrows after each word stamped into the wood above the late style rotating safety. I put it back to WWII configuration but never messed with the tapped hole.

[ABPOS]

Only one hole. Seems odd.