Just finished updates to the Munn Family Events page. The Munn and Barns family are tied together thru the Menktelow family. Some interesting articles on Barns history and family reunions. Amos Barns grandfather, Nathaniel Barnes Sr, 1740-1790?, is listed on the DAR site as A006378, a privateer and he helped evacuate Long Island after Washington was driven out.
The DAR site uses Barnes but all the newspaper references I've found from the 1800 use Barns. I'm afraid both surname are used in by tree. Both appear in a findagrave.com search of Oneida county.