Just north of Harrisburg can be found the site of Fort Hunter. The earliest documentation referring to this site is that of the Chambers brothers, 1726-1730. A gristmill was built there at that time, then the brothers moved to Cumberland County. One founded Chambersburg and brother James returned to Fort Hunter.
During the F&I War--1755-1758-- this site was chosen for one of the forts built at the base of the Appalachians to serve as a first-line defense for Philadelphia. This fort was a main transportation link between Lancaster and Fort Augusta.
Primary documentation substantiates that two gunsmiths worked at this site.
James Chambers, gunsmith and Indian trader, was killed in a skirmish here in 1762. His estate inventory establishes that he was making guns up to the time of his death.
The executor of his estate was one William Foulks. He, too, was a gunsmith. He later served in the Revolution--4th battalion of Lancaster County Militia, raised in Upper Paxton and Hanover Townships and commanded by Capt. Richard Manning.
In 1781-82 he was assessed for 150 acres adjacent to the fort. You can read about this in Pennsylvania Archives.
What was made here and what did they look like? There are no extant specimens that we know of, so this is my conjecture. Chambers was apprenticed to an unidentified Lancaster maker, maybe Mathias Roessor. Likely strong early Lancaster/Germanic overtones. Probably little, if any, ornamentation. Many apparently sold to the Indians who lived contiguous to the fort property. Likely that they did a lot of repairing of militia firearms here, too. This was the defensive center for the Harrisburg area before the city existed. The fort was again used during Pontiac's Rebellion in 1763, then it was abandoned until a beautiful mansion was built there in the Victorian period. It still stands and is now an attractive county park along the Susquehanna River, which is a mile wide at that spot.
If in the area, the park is free, mansion a modest fee for a guided tour, and best steaks in Harrisburg are 1 mile south along the river...shortly after you pass under the longest stone arch bridge in the world. Heck, I should be touting for the tourist bureau.