Extended ignition systems of firearms. From the top: striker-fired, linear hammer with free-floating firing pin, hammer-fired with free-floating firing pin, and hammer-fired with integral firing pin
<a href="//commons.wikimedia.org/wiki/User:Grasyl" title="User:Grasyl">Grasyl</a>
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<span class="int-own-work" lang="en">Own work</span>