Thorn and the last word might be used most but I see a lot of other guns as well. You might think they are easy to use but I've 5-0 full teams with thorn in trials. The weapon isn't the only thing that makes a player good.
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Standard crucible is a bit different than trials though. Trials is more team based and requires some knowledge of the map and it's key areas unlike the crucible where all you really need to rely on is your guns. The trials shows who is good and who is bad, who relies on cheap tactics to win and who doesn't need them.