I am unaware of a store that has an inventory of muzzleloading gun parts.
If you were to describe exactly what sort of lock you need the parts for, it would really help. Modern, antique, military, civilian, time period?
Photos would be helpful.
FWIW, when flintlocks - firelocks - were the standard, the piece holding the flint was often referred to as the c ock. The piece that was struck by the flint was called the battery or the hammer. Frizzen is a later term. The striking part became a hammer during the percussion period.
As an example, here is a photo of a lock for which I need parts. Need a c ock, top jaw and top jaw screw, as well as the frizzen spring. The c ock is the style that is stopped when it contacts the flashpan fence; the frizzen spring has a roller against which the toe of the frizzen bears. The c ock was most likely either double throated or French style. The frizzen spring screw enters the frizzen from the inside of the lockplate. Even with the photo and the description, a lot more information would be needed if parts were to be located.
Unless modern, or a standard military pattern, any parts obtained are likely going to need fitting and reworking. Scratch built is also an option.
