Last week I was given a .22 Browning semi-auto by my brother-in-law that he purchased in 1959. My guess is that it has not been fired in about 45 years, but is in almost new condition. I tried to take the barrel off to clean it, but cannot move the barrel lock enough to do that. I took it to a local gun shop and they finally were able to move the lock sufficiently, but I still have problems with it. They suggested I give it to their gunsmith for a complete check-out and cleaning, perhaps filing the lock to make it move more easily. Cost would be $75. Is this something I should do, or do you have any suggestions how I might do this myself?