How to unlock finished gun

UNLOCKING FINISHED GUN & EATING SPICE!! | Part 105 | Let's Play Enter the Gungeon: Beat the Gungeon

How To Unlock Yellow Tonic (Explainations) [Enter the gungeon]

Finished Gun & Cormorant | Part 30 | Let's Play: Enter the Gungeon: Farewell to Arms | Gameplay

Enter the Gungeon | What Happens with 99 Duct Tape and a Few Rainbow Chests?

Enter the Gungeon - The Finished Gun

Finished Gun Modifiers | Part 96 | Let's Play: Enter the Gungeon: Farewell to Arms | PC HD

When I find the Fossilized Gun in Enter the Gungeon

Enter the Gungeon A Farewell to Arms - How to Unlock the Alternate Starting Weapons

How it feels to get the Finished Gun [Edited by Ivan TheGamePig]