[blueunicorn6]

My Dad talked about “M-1 Thumb”.

[henkster]

My dad had an M1, and showed me what “M1 Thumb” meant. Scared the hell of out me to load the thing. It was a nice rugged rifle though.

[fini]

Everyone who has used a M-1 for a prolonged period has experienced M-1 thumb.

You load the M-1 with an 8 round clip. You push the clip in with your thumb, the bolt closes, and you get your thumb out of the way while the bolt closes- hopefully.

When you are not paying attention, you forget to remove your thumb in time and the bolt slams into your thumb. It happens to everyone ONCE. It does really hurt.