Only the older Marines will know what a M-1 thumb is, and most were coordinated enough to not experience one.
I should have known to stop, but I didn't. Two weeks ago in the local gun shop (LGS) somebody started talking to me just as I let the bolt go home. At least it wasn't a full stroke. Wasn't my rifle, either. My Garand was at home and she knows better, besides.
Clovis, New Mexico USA