A stunner (sometimes named a slammer, in order to avoid confusion with sonic firearms) was a refined version of the Terran pneumatic speargun. This slow-pellet projectile weapon was widely favored for the fact that it could be used safely against shields.
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Less-common variations on this weapon included: gauss pistols and rifles, which had range-settings similar to a stunner's, but which propelled their rounds magnetically rather than with compressed gas; cone pistols and rifles (collectively known as gyrosluggers), which fired miniature self-propelled "jet grenades" that gradually accelerated after being launched...thus largely eliminating the need for range-settings.
Range: 1 - 120 meters (will penetrate an active shield only at 80 meters and closer) Settings: 1 - 6 (will penetrate an active shield only at settings 1 - 5) Size: 15 - 20 centimeters (barrel) Mass: 1 - 2 kilograms Ammunition: 15 rounds per clip