The HRS-3 Cattleman is Hearthstone's only automatic weapon — a simple, robust 9mm submachine gun designed for agricultural defense against wildlife threats and livestock predators. The weapon features a semi-auto/three-round burst selector with no full-auto option, keeping the rate of fire controlled for untrained ranch operators. The 20-round magazine provides sufficient capacity for most encounters without the bulk of military magazines.

True to Hearthstone's philosophy, the Cattleman has no electronic components. Iron sights, manual safety, mechanical trigger. The weapon is finished in a corrosion-resistant matte ceramic coating designed for years of outdoor storage in ranch buildings and vehicle gun racks. The action is intentionally over-gassed to cycle reliably with dirty, corroded, or low-quality ammunition — the kind of ammunition available at frontier trading posts.

At Φ500, the Cattleman fills the gap between Hearthstone's semi-auto Hearth Guard and the security-oriented weapons of larger manufacturers. It provides controlled automatic firepower to communities that face threats from modified wildlife, feral synthetics, and the occasional human predator. The burst limiter prevents untrained users from dumping ammunition in panic, imposing discipline that their training does not.