Oh, hayull, yes! I never got bitten, but I've seen enough cases of "M-1 Thumb".<quoted text>
The other downside was getting your thumb caught in a closing bolt.
One must shove the entire 8-round en-bloc clip into the onboard mag well with the right thumb, while pulling the bolt back with the heel of the same hand. Then release the bolt and get outta the way RIGHT NOW.
That bolt's gonna close like a bear trap.