You need the services of a good gunsmith.
There'll either be a key, a combination lock (tumbler or electronic), or a combination of both.
Gun safe, gun lock, lock on the door of the room when the gun is kept.
So many people are against gun cabinets because children can easily open them when parents forget to lock them and get at the guns. Thieves can easily break into gun cabinets.
A fanciful term for a gun that has an electronic lock.
Flint lock fire arms Match lock came before the Flint lock
Do an internet search.
The frame.
Wheel lock
Contact the maker or a locksmith
There really is no way. If you put the lock on something open important, you may have to cut the lock.
Pick Lock
You can open a key lock on a door knob, or you can open a deadbolt lock on the door itself.