The maker is most likely John Sweeney. Some information on him can be found in Vol. 4 of the NY State Firearms Trade (Swinney & Rowe). It is noted that John Sweeney was born in 1804, and worked in Geneva, Starkey, Bloomfield, and Dundee, N.Y. In 1833 he moved to Ann Arbor, Michigan. (apparently became an innkeeper). He died in 1886.
The rifle pictured is certainly a nice example of an early (ca. 1830) full stock New York State percussion rifle.
Thanks for the photos.
Steve Collward