Garand Thumb or M1 Thumb is the painful condition resulting from a Garand’s bolt slamming into one’s thumb. It’s also the clever name of this blog, where I ramble on about shooting CMP games matches, Service Rifle and XTC.
Garand Thumb is often caused by not locking the bolt back as shown below. As long as one locks the bolt back correctly Garand Thumb is in fact uncommon.
Note: smashing things in the bolt of your Garand, while lots of fun, is a good way to get a barrel obstruction. If you must try this check your rifle for barrel obstructions before you shoot it or put it away.