I have several rifles I took to the range yesterday and came home and as my usual order of things cleaned them immediately. I took my old 303 Brittish Lee Enfield out and fired her-still shoots great,but when I cleaned her I went to close the bolt and it "poped open"the bolt was all the way down in position and jumps open. The only thing I can think of is I reassembled it incorrectly -which is pretty dumb because it can only go in one way and with one push down to release. I did move the firing pin on the bolt by pulling the pin back using the tab at the back,and might have moved the "pin as it has a tract it can go into 2 different positions.The only thing is in the second position it wont go into the breach of the gun.any ideas??