101Leafy researched the games.
Empr Lao-Shan Cannon

The best materials and the latest technology form a gun that will live on forever.
| Class | Heavy Bowgun |
|---|---|
| Rarity | 8 |
| Attack | 384 |
| Affinity | -10% |
| Defense | +14 |
| Slots | 0 |
| Reload | Slow |
| Recoil | Small |
| Table price | 10,000z |
Listed in the equipment tables of 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 788.
Ammo
| Item | Load |
|---|---|
| Normal S Lv2 | 6 |
| Normal S Lv3 | 9 |
| Pierce S Lv3 | 3 |
| Pellet S Lv3 | 4 |
| Crag S Lv3 | 1 |
| Clust S Lv3 | 1 |
| Flaming S | 3 |
| Water S | 3 |
| Thunder S | 3 |
| Poison S Lv2 | 1 |
| Tranq S | 2 |
| Paint S | 2 |
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 788.
Materials
Azure LaoS Shell ×5, Lao-Shan's Ruby ×1, Lao-ShanCarapace ×3, Wyvern Stone ×4