I live not all that far from Albany. Most people believe that there were no rifles uphere, or made here. I've looked, but have found nothing that says a riflesmith worked in the Albany. I know all the guys up at Ti, go there pretty often, and have never heard them say they have a rifle from NY from the 18th century. I'm not saying I don't belive you, cause if they said it, it's probably true. It just gives me another reason to go to the Pell Center (like I need another).
Supposedly Sir William Johnson imported several riflesmiths from Penn in 1768 and brought them to Esopus(Kingston), Canojaharie, Schenectady, and Johnstown (Dillin, The Kentucky rifle). Kingston was the Capital at the time, Schendectady was a growing town, always important militarily and for going West, and Johnstown and Canajaharie were frontier settlements. As to what the rifles might have looked like, is pure specualtion. I'd assume they'd make what you asked for. Johnson, always trying to make a buck would have sold rifles to the public, not just for trade, so I think it very possible that rifles were used in NY before the Revolution. It's one of those debates that will go on forever. The Dutch made rifles as well, so it was in there abilities to build one. It might not have the architecture of an American rifle, but a rifle none the less. Keep us posted as to what you find, might be a neat project to build one next winter.