Bungie please understand how unfair this quest step is. It makes everyone camp over the heavy ammo and its taking away from the actual game. Its near impossible for me to even get close to heavy ammo to complete the 10 Power Ammo Kills step in the Saladins Guantlet quest.
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I did mine with a grenade launcher...took 3 matches at most, and that's without getting the heavy every single time. (I'd forget about it spawning lol)