There's nothing really to upgrade on that Angel, you probably won't notice any difference if you change the reg out for another. The only thing you could possibly do would be to slap an evolve kit on there, the second version of the kit that's out now seems to have alot less problems than the first one did. And there's nothing special about the trigger, it's the same MT trigger that all the MT's sell. Oh, and don't believe anything that bps counter says either
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