A series of entries in Moravian ledgers proves that in the mid-1750s they were purchasing gun locks and "gun brasses" (and guns themselves).
Regarding payment, how Indians in particular paid, etc.: the Moravian gunstockers/gunsmiths had the unusual luxury of not needing to worry about earning a living. The communal economy (1741-1762: Albrecht, the first gunstocker, arrives only in 1750) ensured everybody food, clothing, housing, medical care, etc., in exchange for their labor. Albrecht was in Christiansbrunn when the communal economy in Bethlehem ended--but it persisted in Christiansbrunn until 1771, so he always worked (until he moved to Lititz) in an economy in which he did not need to worry about "the bottom line." However, to pull his weight he needed to work--and this gets back to the point I made in an earlier post. There wasn't full-time work for a gunstocker in the Moravian communities. So he was assigned to other duties ... and when an additional gunstocker (Beck) arrived (1761), authorities had to find something for him to do or somewhere to send him where a gunstocker's work was needed.
We know that Indians paid, at least in part, in goods rather than cash. In 1750 at Bethlehem, for instance, the gunstocker earned only £0.3.0 (Albrecht had arrived mid-year). But the following year, when most of the work was for Indians, the gunstocker's trade earned £4.3.3½ in cash--and more than £6 worth of venison, deer skins, and butter. So more in trade than in cash.
Most of the work of the gunsmith in Bethlehem throughout the 1750s was for Native Americans. This is why, in our recent article, Bob Lienemann and I propose that "during the 1750s the gunstocker’s activity contributed more to supporting mission work than it did to the General Economy." The Moravians needed a gunstocker to service the Indians' needs (and train the next generation)--but he did not provide an urgent service for the residents of the Moravian community itself such as the shoemaker or the butcher. It's worth noting that when the Moravian settlements needed weapons to defend themselves in the mid-1750s, they purchased them from New York.
Scott