Zius BK1s + BK2s Springs

These Zius BK1s + BK2s Springs are tuning springs to dial in the FPS of your BK1s AEB.

FEATURES:
• Zius BK1s + BK2s Springs
• Tune your AEB’s FPS up or down
• More spring options coming soon!

INCLUDES: 
• 1 BK1s spring of your choice

PERFORMANCE:
Average FPS (Standard Deviation) with the BK1s 200mm barrel
• 172 (6) with Zius Stock Spring
• 133 (10) with OOD 1.4 x 155mm spring
• 162 (6) with OOD 1.5 x 155mm spring
• 169 (8) with OOD 1.6 x 155mm spring

Average FPS (Standard Deviation) with the BK2s 160mm barrel
• 166 (5) with Zius Stock Spring
• ~130 with OOD 1.4 x 155mm spring
• 175 (5) with OOD 1.6 x 155mm spring

SPECS:
• Material: Spring steel
• Dimensions: 
• Weight:

LINKS:
• BK1s
• Barrels