Look that bolt over closely every time you clean it.
I think it was Brian Q who had posted a picture that showed the right lugs torn off multiple bolts. That picture stays on my mind.
Also noticed this one on GB this morning....
M1 CARBINE BOLT : Bolts at GunBroker.com
M1 CARBINE BOLT : Bolts at GunBroker.com
FWIW,
Charlie-painter777