BB models are smoothbore, while pellet models have rifled barrels. Smoothbore artillery refers to weapons that are not rifled. Hunting laws may differentiate between smooth barreled and rifled barreled guns. Operators may fire spin-stabilized rounds from either a smoothbore or a rifled barrel. The Napoleonic cavalry charge was made both obsolete and suicidal by rifled muskets. They have rifled bores, lower muzzle velocities and shorter barrels than equivalent guns. Guelzo also points out the technical difficulty of aiming a rifled musket. However, soldiers armed with rifled muskets were not always successful on the battlefield. The barrels of underwater pistols are typically not rifled. Modern slugs are moderately accurate, especially when fired from special rifled slug barrels. It is not a rifle as the barrel is not rifled. A rifleman is an infantry soldier armed with a rifled long gun. The barrel was often rifled, which improves accuracy. There are also rifled choke tubes of cylinder bore. She was armed with thirty-six rifled guns.