I have a 6.03mm tightbore in my CA M24, and it hasn't jammed yet and tightened my groups up decently.
I have a KJW M700 as well and it shoots relatively well, but is fussy for heat & humidity changes. I read one account that claimed it has a 6.05mm inner barrel in it, as opposed to the standard airsoft barrel of 6.08mm.
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