Board Thread:General Nerf discussion/@comment-27923854-20160426022623/@comment-3362895-20160430200545

Why not a spring upgrade on both? In fact, I'm planning to do all three mods on each blaster type. (Plus four of my five Stampedes. Yeeeeeehawww!)

Upgrade springs are a little harder to find for the Swarmfire, but Containment Crew does carry them in the US.