Screwless Design: C96
The German C96 ‘broomhandle’ Mauser only has one single screw. That screw simply attaches the C96's pistol grip panels to the receiver. The rest of the pistol's parts fit together perfectly, such was the design and craftsmanship of the pistol it needed no other screws.
Add a scope and a fancy muzzle cap/flash hider and you’re ready for space piracy.