Firearms; hunting firearms; sporting firearms; muzzle-loading firearms; air pistols; air rifles; weapons in the nature of spring-activated spearguns; pistols; submachine guns; automatic rifles; semi-automatic rifles; shotguns and parts thereof; hunting rifles; heavy guns; holsters; pistol holsters; gun and rifle cases; rifle straps; sling straps for firearms; adjusting knobs for gun sights; ammunition for firearms; air pistol bullets