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Rifled weapons include handguns, pistols and revolvers, and rifles. These are weapons in which spiral grooves have been cut into the length of the interior or bore of the barrel (Fig. 1). Rifling consist of ‘lands’ and ‘grooves’ (Fig. 2). The ‘lands’ grip the bullet as it passes down the barrel, giving the bullet a rotation, which has a gyroscopic effect that increases the stability of the bullet’s trajectory and thus its accuracy (Fig. 3). In contradistinction to rifled weapons, shotguns are smooth bored. This is because rifling in a shotgun barrel would cause the shot to disperse to quickly in a 360 degree arc.