They are mentioned early in the 18th century.
The Pennsylvania Gazette
September 20, 1739
RUN away ...a Servant Lad, named Richard Beddes, aged about 17 Years, has light bushy Hair: Had on an old striped Jacket, old linnen Shirt, new Linnen Breeches and an old Hat, no Shoes nor Stockings. Took with him a smooth Rifle Gun.
The Pennsylvania Gazette
January 26, 1769
RUN away from his bail, ...had on, when he went away, a blue broadcloth coat, with mohair buttons, a red plush waistcoat, leather breeches, and a fine hat; he also had other clothes, of a light ash colour, lined with striped linsey, the coat had no lining in the sleeves; these he had packed up in a pair of check trowsers; he may dispose of one suit; he took with him a smooth rifle gun, and as he has served his time, he may possibly produce his indenture.
The Pennsylvania Gazette
Philadelphia
February 15, 1773.
To be SOLD very cheap.... A QUANTITY of this country and German made RIFLES , both cut and smooth bores, in the best manner;
Virginia GazetteӬ(Purdie)
Williamsburg Ӭ
April 21, 1775.
Fifty six dollars reward. RUN away last night from the subscribers,....They had, and took with them, a country square-barrelled smooth bore gun rifle-stocked, one pistol, and other fire-arms.
Spence