MM Firefly 12KG Main Spring

The MM Firefly 12KG Main Spring is the stock spring that ships inside every Monkee Mods Firefly Blaster, and it's also the one you reach for when that spring finally loses its snap. Spring rate is 12KG, tested at roughly 200 FPS in a Firefly using Worker Gen 3 Darts, making it the strongest option in the Firefly spring lineup and the pick for players who want their blaster hitting at full stock power.

Swapping it in is a straightforward internals job on any Firefly Blaster — pull the worn original, drop this one in, and you're back to rated performance. If 200 FPS is more than your field allows, Monkee Mods also stocks lighter Firefly springs rated down to 5KG for a milder build.