I particularly like using the auto rifle(s) in the crucible but have noticed at times when I push and hold R2 it only fires a single shot like the scout. If I let off and push it again it works correctly but by that time I'm dead. I'm curious to know if anyone else has had this issue.
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I have had this happen with my fusion rifles not charging. It happened in the alpha too. Must be some sort of random glitch.