Two years after he started the Philadelphia Gun Co., Fox founded the AH Fox Gun Co., of Philadelphia. Using his success at shotgun events as a launch pad, Fox began producing some high-quality double-barrel shotguns in a variety of grades. He brashly claimed that his shotguns were the finest in the world.

Whether they were the finest can be debated, but Fox did produce a very solid boxlock double with internal hammers. What separated the AH Fox gun from similar boxlocks was a barrel extension combined with a horizontal-axis rotary fastener to lock the barrels into battery and a top lever for opening. The double triggers were compact, each engaging a sear on a hammer with an integral firing pin. All together, the Fox was a sturdy and reliable shotgun and relatively sleek and stylish for its time. In 1929 the company A.H. Fox was sale.