101Leafy researched the games.
Grand Slam G

Latest improvement methods boost this up to G-Level standards. Shelling Lv4
It gives up the lance's piercing power and instead uses the whole shaft to deliver impact to the target. The tip is covered in countless small spikes, and pressing that surface against the opponent inflicts the poison worked into the Gypceros hide that covers the whole weapon.
Our translation of 復刻 ハンター大全 (KADOKAWA / Enterbrain, 2014), page 165.
| Class | Gunlance |
|---|---|
| Rarity | 9 |
| Attack | 621 |
| Poison | 240 |
| Slots | 1 |
| Shelling | Normal Type Level 4 |
| Table price | 100,000z |
Materials
Commendation S ×1, Gypceros Head ×3, HrdPuGypcerosWng ×4, DeadlyPoisonSac ×5