https://www.simplyscuba.com/collections/spearguns
Spear guns come in two options: Sling or Pneumatic.
Sling guns use a rubber bungee under tension to propel the shaft through the water.
Pneumatic guns have an internal barrel that connects to a separate chamber filled to a pressure of about 20bar. Pushing the spear into the barrel compresses the separate chamber closer to 35bar that is used to fire the shaft.
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