Illustration of how HK416 A3 trigger group works, which is capable of switching to "SAFE" when the hammer is not cocked
<a href="//commons.wikimedia.org/w/index.php?title=User:Andy_Sou&amp;action=edit&amp;redlink=1" class="new" title="User:Andy Sou (page does not exist)">Andy Sou</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>