I am not a Lefever owner. Now, that established my question. I am looking at a 1904 G grade Lefever to purchase. In attempting to remove the barrels from the receiver, they are hung up on something in the slot. Rather than lifting free there is something, perhaps the hook retaining the lump. As it is not my gun i am not familiar with barrel separation. Is there a 'trick' to this simple action? Thanks.