<a href="https://en.wikipedia.org/wiki/Gun-type_fission_weapon" class="extiw" title="w:Gun-type fission weapon">Gun-type fission weapon</a> (<a href="https://en.wikipedia.org/wiki/Little_Boy" class="extiw" title="w:Little Boy">Little Boy</a>).
Vector version by <a href="//commons.wikimedia.org/w/index.php?title=User:Dake&amp;action=edit&amp;redlink=1" class="new" title="User:Dake (page does not exist)">Dake</a> with English labels by <a href="//commons.wikimedia.org/w/index.php?title=User:Papa_Lima_Whiskey&amp;action=edit&amp;redlink=1" class="new" title="User:Papa Lima Whiskey (page does not exist)">Papa Lima Whiskey</a>, lines modified by <a href="//commons.wikimedia.org/wiki/User:Mfield" title="User:Mfield">Mfield</a>
CC BY-SA 3.0
Based on an illustration by FastFission (<a href="//commons.wikimedia.org/wiki/File:Gun-type_Nuclear_weapon.png" title="File:Gun-type Nuclear weapon.png">Image:Gun-type Nuclear weapon.png</a>) and a modified version by Howard Morland (<a href="//commons.wikimedia.org/wiki/File:Gun-Type_Fission_Weapon.png" title="File:Gun-Type Fission Weapon.png">Image:Gun-Type Fission Weapon.png</a>). The bullet and the target were slighty modified (the bullet was a stack of rings).