A pellet gun, but it all depends. Pellet guns are more powerful and can actually go through you depending on the power of the rifle. Airsoft guns are just there to hurt.
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Depends on what you're planning to do with that gun. Are you trying to hunt something? Get a pellet gun. Are you going to play airsoft at an field? Get an airsoft gun. Are you going to use it as a self-defense weapon? Get a pellet gun. Are you going to use it to annoy someone? Get an airsoft gun. It all depends on what you want to do with that gun.
Just know this:
Pellet guns are capable of piercing skin.
Airsoft guns are capable of creating small welts.
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