I loved the callback to the classic plasma rifle in the upcoming DOOM:Eternal that I designed a pistol inspired by the rifle and loved how it came out!
I designed the parts so that they connect together using pegs and holes. Each part has both male and female connectors and there is a separate file for the connectors which join the trigger guard and ammo file together.
The pegs/holes may need some cleaning up just in case they don't fit properly.
This is my most ambitious model I made and it all started from a rough sketch.
Enjoy and happy demon slaying!