Probably the Ballista/DSR and the first shotgun are the most common Gold (IMO) since most don't bother with the others in the category. Was about to jump right in and say PDW and MSMC, but everyone runs Diamond on them since they are so easy to get.
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#10InsanityKicksInPosted 2/13/2013 7:25:07 PM
Everyone and their mom has diamond SMGs, I've only seen one other person besides me with diamond ARs. --- Xbox Live & PSN - InsanityKicksIn