Why Won't the lock bolt fit through?
If your lock bolt won't fit through try this: Check to see if your barrel is all the way against the stock at the breech. Does it go through the barrel in place? Determine if the tap from the drill guide kit will be enough to make it work. If not, use a small round file to elongate whichever hole- either the one in the barrel (metal), or the one in the stock (wood).