Hey, It happened in 1966, I've learned alot since then. I don't know whether I should relate this experience or not. I.T.R Camp Lejeune,our platoon was going thru a pop-up target range using M-1's, we were about the 6th platoon being cycled thru the drill. The P.M.I drill instructor told us that the rifles would be very dirty and hot from laying in the sun. He said under NO circumstances should we try to clear a jam by ourselves and further reiterated that he or any of the other instructors should not catch any Marine stomping on the op-rod to clear a jam. I get up to about the third target and pick up the rifle, I take off the saftey and pull the trigger Nothing ,Nada. I attempt to eject the round and could not get the op-rod to pull back, I takes a quick look up and down the line and no instructor and sure enough I tilt the rifle towards the target and applies a heel to the op-rod. All of a sudden I'm on the ground sucking dust with and excruciating pain and pressure between my shoulder blades. I thought I had done shot myself and from the voice I heard next, thought I had died and gone to Hell. I will never,ever attempt to clear a jam again with my foot ever, I will never try and stomp my Marine Corps rifle again. I think I have a size 13 boot track permanently implanted between my shoulder blades to remind me.