I currently have 1 Idea.
The Explosive Olympia: Meta-Medallion
To do: Pack-A-Punch the Olympia Twice
Advantages:
-No self explosive damage
-More ammo (Specificly 4 bullets)
-Fast mag (Reload all 4 at once)
-Faster reload speed
-More ammo
-Target finder
-One bullet continuesly explodes 3 times
-REALLY powerful damage