D.H. Hilliard (1805-1877) was a gunsmith in Cornish, NH. His designs are similar to Nicanor Kendall's for the simple reason that Hilliard worked with Kendall before starting his own gun shop sometime around 1840.
The target rifle is a .36 caliber with a 25 inch rifled barrel, walnut stock, and iron furniture and peep sight on an extension. It possibly had a provision for a false muzzle, or the round end on the barrel was simply decorative. There are no holes for locator pins in the end of the barrel.
The gun has been poorly repaired, with a resoldering of the ramrod ferrules and flashcup, but is in otherwise very nice condition. It balances nicely and the sights line up easily. The lock does not have a half cock position.