Star Mega Double Breach 9KG Spring

The Star Mega Double Breach 9KG Spring is a drop-in replacement spring rated at 9KG, built for the Nerf Mega Double Breach — a break-action springer where spring weight has a direct, noticeable effect on how hard it throws a Mega dart. At 9KG it's stepped up from a stock-weight spring, giving the blaster more punch without touching the barrel, plunger, or anything else in the internals.

Installation follows the same drop-in process as any Double Breach spring swap: open the shell, pull the old spring, seat this one in its place, and reassemble — no cutting, no shell modification, no extra parts required. It's priced as a bargain-bin internal upgrade rather than a full kit, which makes it an easy first mod if you're just starting to tune a Double Breach and want more output before you start looking at plunger tubes or seals.