Kill enemies in a Weekly Nightfall Strike until the Fusion Rifle stabilizes.
Return the Prototype to the Gunsmith.
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The weapon is dangerously unstable and cannot be wielded. The Gunsmith has given you a sensor to gather telemetry on fusion rifle performance. Use other fusion rifles until you have enough data to stabilize the Pocket Infinity.
The weapon is nearly ready. Bring the Prototype to the Gunsmith to detach the sensor.