It is arguably the best stock for the burstfire rifle as it greatly decreases spread and recoil and increases range, but at the cost of your run and your scope-in time.
In-game Description Edit
Heavy Burstfire Rifle stock. Greatly improves spread and range, while reducing recoil, but increases scope-in time and reduces running speed.
- 1 Day: 120 GP / 10 ZEN
- Permanent: 1400 GP / 75 ZEN