Dominate the battlefield with serious firepower! This high-tension piano steel spring upgrade for your Nerf Rival Takedown XX-800 delivers brutal FPS gains and unmatched range – choose between 11.5kg (competitive) or 13kg (elite-level) tension to suit your play style.
Why This Upgrade?
💥 Massive Power Boost – 30%+ stronger than stock for jaw-dropping performance 🔧 Complete Installation Kit – Includes necessary O-rings for perfect seal 🎯 Laser-Focused Accuracy – Consistent power for tighter shot groupings ⚡ Piano Steel Construction – Military-grade durability that won't fatigue
What's in the Box?
1x Takedown XX-800 Upgrade Spring (11.5kg or 13kg)
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