So it seems. I’m pretty happy with the monster lock on my Pedersoli 1766 Charleville, it sparks like a beast! But, I am tuning it. Internals were very rough cast, and lots of burrs gouging the lock plate. Geometry is good, parts that need to be hard are extremely hard! A very good lock, soon to be butter smooth, lighter springed, and better. IMHO.Shoot it as is, but you might consider getting a lock upgrade. Locks on production flint guns aren't know for sparking reliably...
To each his own tough. Lots of guys buy a production gun, and do nothing to it, but shoot it. Since it is a used piece, the previous owner/builder (builder could be a plus here) May have already tuned and polished your lock. More likely in this case, than a factory gun out of the box.
Would probably take the advice of these guys who shoot your Lyman, and jump on that Upgraded hammer.