101Leafy researched the games.
Hard Bone Cannon

Based on bone materials, it boasts the amazing Shelling Lv5 special customization.
| Class | Gunlance |
|---|---|
| Rarity | 9 |
| Attack | 598 |
| Slots | 2 |
| Price | 100,000z |
Upgrades
| Upgraded from | Heavy Bone Gunlance |
|---|
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 758.