I wanted them for ages and couldn't get them to drop for me but finally they did from one of the crucible bounties. The automatic reload perk is pretty useful but I don't really see the need to move faster while crouching. If you crouch and move around in the tower, the extra speed just makes your character look retarded.
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The reload perk is outstanding, as is the generic special/heavy ammo.
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works great in raids like WotM, the crouching is good with the zamboni parts and auto reload is good for DPS