BoomCo 4" M6/Farshot Spring (00D CUSTOM) 110+ FPS with easy install
NOTES FROM LUKE: The 4" M6/Farshot Spring is an OOD Custom specifically designed for the BoomCo M6. Offering an easy install and 110+ FPS, this will outperform almost any non-homemade Nerf blaster with the farther travel at a given FPS. The range and FPS on this spring are higher than other springs, including the century spring. If you're looking for a slightly easier prime, order the Kronos spring for 100FPS.
FEATURES: It's cut exactly to what I feel is the perfect M6 spec. Any longer than this and installation is nearly impossible.
110+FPS, and that's the AVERAGE. I've tested a dozen different lengths, and this was the perfect balance between power and reliability. Too long a spring results in fishtailed shots, but this one sits right in the Goldilox zone.
SPECS: Cut-to-Length Compression Spring Spring-Tempered Steel 4" Long