Never got one in the 6 years it was issued to me, nor with the one I own now.
We were trained to hold the op-rod tab with the heel of the right hand and depress the follower with the thumb. As soon as you could feel the op-rod release, you simply raised the thumb out of the way by pointing it forward towards the muzzle and then raising your hand out of the way, letting the bolt slam forward. The Marines were very particular about how this was done because one had to do it properly when closing the action to attain "Port Arms" from "Inspection Arms" during the hundreds of rifle inspections I had to attend. If you didn't do it properly to the satisfaction of the inspecting officer, you were given "Additional Instruction" to the tune of hundreds of opening/closing the action, which could leave a sore and sometimes bloody hand.
I did witness an intentional "M1 Pinky" given by one of our DI's. We were on the rifle range where the M1 action was required to be open 24/7 unless you were on the firing line. One of our platoon recruits somehow got up from the firing line with the action closed. He was made to put his pinky finger into the chamber and the bolt was allowed to close on it and it was then given a couple of hits by the DI to insure it was "seated". It looked broken when it was removed. Remember, this was back in 1955 when training and disclipine was a bit different than it is now.