With your newly found toy, Zed wants you to test it out on the local bandits. You need to kill a total of 25 bandits with the E-Tech gun, and while the mission marker is inside of the cave you are initially in, you don’t have to stay here. Note that a total of 14 Psychos will spawn inside the cave and come after you, so be prepared.

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You have to use the mission weapon to get kills (left). If you run out of bandits, go to the entrance of the Southpaw Steam & Power (right) to find more.

Only kills done with the E-Tech weapon count towards the total and while you may think it uses a special kind of ammo, it is actually an assault rifle. That means if you run out of ammo, which can be likely, just scrounge up or purchase more rifle ammo to continue. Also, the entrance to Southpaw Steam & Power, as well as inside of the place, are excellent spots to up your bandit count. Once you’re finished, return to Zed to get your reward.