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Core Series I Upgrade Spring (5+ KG) – Nerf

$7.50 $3.00

Out of stock


The spring has a power output of over 5 kilograms (2.5kg stock) and will bring the muzzle velocity of your blaster up to 100+ feet per second while maintaining the ease of use.

  • Retaliator
  • Rampage
  • Elite Alpha Trooper
  • Sharpfire
  • Slingfire
  • Dominator
  • Stormtrooper Deluxe
  • Mega Bigshock

5kg fire compression mainspring (2.5kg stock)

  • 100fps muzzle velocity with up to 75ft range (parallel to ground)
  • 100fps muzzle velocity with up to 85ft range (30 degrees angled to ground)

Be sure to watch the FPS Test Video for this product.

Disclaimer: Mod at your own risk!
Increasing the spring tension can break or damage the stock internal components of your blaster. By purchasing, you agree not to hold Bloom Technology liable should this occur. In addition, we may not be able to troubleshoot problems due to user error.

Additional information

Weight 9 g
Dimensions 115 × 35 × 20 mm


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