101Leafy researched the games.
Gunhammer Prototype

Made in a distant town, this Hammer is the subject of envy in many workshops.
| Class | Hammer |
|---|---|
| Rarity | 3 |
| Attack | 572 |
| Fire | 300 |
| Slots | 0 |
| Price | 3,100z |
Upgrades
| Upgraded from | Iron Striker |
|---|---|
| Upgrades into | Dead Revolver |
Can also be made new at the smithy.
Upgrade tree from モンスターハンターポータブル 2nd G 公式ガイドブック (Enterbrain, 2008), page 720.
Materials
FireWyvern Fluid ×4, Machalite Ore ×20, Flame Sac ×1, Gunpowder ×20