SpudFiles

jackssmirkingrevenge wrote:A hammer valve is what practically every commercially made pneumatic airgun uses to fire - imagine a blowgun valve, but instead of pull it with your finger, a spring-loaded hammer strikes it and opens it briefly to allow enough air to fire one shot to escape from the reservoir.

Here's an old example, the Girandoni air rifle:



The yellow striker pin is propelled by a spring to hit the valve and release a burst of air.