So what's the easiest way to obtain it these days? Boosting is still an option but it's quite hard to find people in a game that will help you, let alone come across a map that has a Spartan Laser in it.
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Hope or a map with the laser and kill two people with one shot. That's what did it for me. . . Really though best bet would be king of the hill or (sorry the name escapes me) where you have to hold the ball. A lot of people rush the same area well ignoring you waiting.