2-Gun Duck is a male anthropomorphic duck.
A cousin or ancestor of Donald Duck's, 2-Gun Duck is presumably some sort of marksman or Wild West figure. On the Chart of the Duck Family Tree owned by Elvira Duck, he is present on the same branch as Ebenezer Duck.
Behind the scenes
2-Gun Duck's name only ever appeared in the Duck Family Tree from 1960 comic story Family Fun.
Gilles Maurice once speculated that he may be the same individual as Buckaroo Duck.