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I've used mostly Systema 6.04mm tightbores, but more rather through happenstance than conscious choice. They've worked well with all the BBs I've put through them (KSC, MT, MB but the majority has been BB Bastards).
I had a DeepFire 6.04 SS barrel and it shot very nicely. It was 550mm long and shot nice tight groups.
Consistency in shot to shot FPS + length of barrel + tightbore = accuracy
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