MM Firefly 7KG Main Spring

The MM Firefly 7KG Main Spring is built for Humans vs Zombies games and other events that run a lower FPS cap than standard skirmish rules — it sits in the middle of the Firefly spring lineup, well below the stock 12KG but with more punch than the softest 5KG option.

Tested in a Firefly Blaster with Worker Gen 3 Darts, this 7KG spring chronographs at around 120 FPS, which comfortably clears most HvZ FPS limits while still giving you usable range. Like the rest of the Firefly main spring range, it's a direct internals swap with no other parts to change, using the same install steps as the 12KG, 10KG, and 5KG options in the lineup.