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Out the box mutant short shot string are these acceptable?

An ES of 12 and 13 over 37 and 39 shots is awesome! You'll have a hard time asking for better than that. Usually if a gun is within 30 ES I would call that good. 20 and under is really good. If you really got a 12 and 13 ES with any gun right out of the box that is even better because most regulators need to be shot quite a bit before the regulator "settles in" and performs it's best. It sounds like you're getting lights out performance right out of the box without needing a settle in period. Your results seem to be comparable to others that I've seen reviews of. The Mutants apparently have regulators that function at a very high level. Congrats on getting a nice gun. Now we just need pictures and a full review!!! haha