stick with the 6.03, this way you won't have to get really exspensive ammo to ensure the quality is there to keep from jamming. Also on that note, I'm running a Madbull 6.03 tightbore, and I can say that I'm not all that happy with it, I'm still getting the same shot spread with it as I was with the stock barrel at the same ranges, no difference, in fact I think the CQB inner that I had in it at one time was doing better.
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