Coot said:
As already noted, there is risk in removing the barrel and it is not necessary for routine cleaning. If it needs to be removed, I learned this method from a very respected builder & his proceedure has worked well for me:
First partially unscrew the lock retaining screws & gently push the lock out, then finish removing the lock screws & lock. Never try to pry the lock out as this will damage the wood at the edge of the inletting. On some loosely inlet guns, the lock will simply fall out.
I applaud you for being so generous as to type all that out!
However, I must add two things that must be done first.
Number 1. Remove the ramrod. The reason for that is some times on both original and reproduction rifles, the front lock screw had to be turned or filed smaller in diameter to clear the ramrod hole. If that is the case, you can't tap the front lock screw out with the ramrod in the gun. So it is best to do this first, whether or not you later find it had to have been done.
Number 2. Pull the Cock (AKA hammer) back so it locks into the half cock position. If one does not do that on some original and reproduction guns, the tail of the sear and/or the mainspring MAY be below the bottom of the lock plate when at rest. If that is so, one can easily bust out a chunk of wood around the bottom of the lock plate when trying to remove the lock. Cocking the Cock to Half Cock almost always ensures that can't happen unless the lock has broken parts on the inside.
This is probably why the gunsmith you mentioned suggested not to take the lock all the way out.
Gus