Let's see what the community thinks which AR is the best and possibly why you do think that. Though I'm thinking the Suros might have the advantage from the sheer number of players that own it and say it wrecks in pvp, I just got the Hard Light and I'm itching to upgrade that bad boy and compare the two. Monte Carlo still remains a mystery to me, however, but that's what you guys and gals are here for!
Speak and let your words be heard!
[I have SUROS selected because it's helpful on raids currently and haven't leveled Hard Light]
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In an ar duel, i usually lose more to SUROS and win more with mine. I'd suggest SUROS is one of the strongest, and most effective AR's in the game. I'm surprised bungie chose it as an item from xur but i won't complain!