I am just guessing from your pictures, but it looks like the pin stops against the bolt head. If the tail of the bolt head were trimmed .o14 to let it travel more you would have .0450 protrusion. With out the parts in front of me to play with that is just a WAG :)

next thing to look at before doing anything, it there enough room for the cocking pin to travel that much in the decocked position?