Be careful of Garand thumb, make sure bolt is ALL the way back. When inserting enbloc, keep strong pressure when pushing it down, bolt will move forward about 1/4" an stop, AS long as you keep downward pressure on top of the rounds, if you don't, bolt could go all the way forward an bite your thumb....NOW, that you are keeping downward pressure, quickly flip your thumb out of the way of the bolt an OP rod, the bolt may or may not slam forward...if it doesn't its ok..just tap the back of the OP handle with your palm an it will feed the round. When taking rounds out, pull back OP handle an hold it back with right hand...using the left hand cover the rounds with palm an press with your thumb the clip latch(left side of the reciever) an the rounds an enbloc will jump up for removal. Holding still back the OP handle, press down on the slide follower with left thumb, an slowly ease the bolt forward to close...never let it slam forward without a round....once again, watch out for your thumb!!!! my son got M1 thumb an bled like a stuck pig!