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[–] JacobJaredKenworthy 0 points 3 points (+3|-0) ago 

BB guns usually do use springs to compress the air, but the actually propelling force comes from the compressed air.

Not all airguns are toys. Lewis and Clark used a .46 caliber Girandoni air rifle on their expedition. It's very lethal. The Austrian army also used the Girandoni.

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[–] Niggardly_Jew 0 points 1 point (+1|-0) ago 

Pneumatic weapons can be lethal! Although they have a generally longer reloading time, they are also usually much quieter.