All these muskets and all these names, and I don't think I have ever heard of any of them before!
John, in all these lists (there are lots of such lists), it is very hard to tell whether the merchant is getting these rifles and muskets from individuals or from gunsmiths. When there's a large purchase, you can assume gunsmith (even if you don't know the name), but one rifle or one musket at a time ... hard to tell. I would guess most of the folks listed here are individuals whose rifle or musket was purchased (willingly or not--that's another thing that these lists don't tell us).
The puzzling thing about this list, for me, are
all the marks on the arms: all these arms were marked by March 1776, before they were purchased for use by soldiers? That's strange. But if these arms had been marked because they were already in military companies, why would Postlethwaite be purchasing them for military companies? I'm not sure I understand.