On land, the ADS fires 5.45х39 mm bullets—the current standard round for Russian assault rifles—up to a range of 1640 feet. In water, it uses a slightly shorter bullet, whose range is constrained by the depth of diver when firing. At 100 feet underwater, it can reach targets 82 feet away. After a diver emerges from the undersea battle, he or she can switch out a magazine of underwater bullets for a magazine of normal bullets, and continue firing on land with the same gun. Such modern convenience in bizarrely niche combat situations! There's also a grenade launcher on the ADS, though no mention yet of any special underwater grenades.