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mateba, you have that reversed.
A tightbore inner barrel has less internal volume than a larger bore inner barrel would, and as a result, you're more likely to require a bore-up kit on a STOCK inner barrel, and less likely to require a bore-up kit if you use a tightbore.
Of note: I've used a Systema M120S and PGC M130 spring on a 590mm 6.03mm inner barrel before and tested performance with both a Systema Type-0 inner barrel as well as a Systema Bore-Up kit and noticed zero difference in performance.
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