46 C.F.R. § 160.031-2 Type and size.
Title 46 - Shipping
(a) The shoulder gun type line-throwing appliance shall be breech-loading for the cartridge and muzzle-loading for the projectile, of not more than 13 mm (0.50 in.) caliber, chambered for blank rifle cartridges, smooth bored, and properly stocked, with shot line canister attached in a position below the barrel. (b) [Reserved]
Title 46: Shipping
PART 160—LIFESAVING EQUIPMENT
Subpart 160.031—Line-Throwing Appliance, Shoulder Gun Type (and Equipment)
§ 160.031-2 Type and size.
