Umarex HDR50/TR50 Steel Barrel: Do You Need Shaped Projectiles?
Round balls remain a projectile shape to consider after a barrel change. That does not make every .50 ball a confirmed match for every replacement barrel.
Read guide
Z-RAM GUIDE
Z-RAM technical knowledge
Z-RAM 指南
Practical product, compatibility and installation guides for Z-RAM systems.
Umarex T4E HDR50/TR50 升級指南：完整 CO₂ 與 HPA 影片系列
依照這三支 Umarex T4E HDR50/TR50 影片作為一個連貫系列，並以 12 g CO₂ 設定或獨立 HPA 改裝作結，且包裝範圍要明確劃分。
Read guide