OTHER FIREARMS AND SIMILAR DEVICES WHICH OPERATE BY THE FIRING OF AN EXPLOSIVE CHARGE (FOR EXAMPLE, SPORTING SHOTGUNS AND RIFLES, MUZZLE-LOADING FIREARMS, VERY PISTOLS AND OTHER DEVICES DESIGNED TO PROJECT ONLY SIGNAL FLARES, PISTOLS AND REVOLVERS FOR FIRING BLANK AMMUNITION, CAPTIVE-BOLT HUMANE KILLERS, LINE- THROWING GUNS)