Barrel length for m4a1/ v2 punisher

I looking to put a metal barrell in my m4a1, can anyone one tell me that rhe ideal length is. I useing a 100 percent cylinder

It will depend on a few factors and there will be many oppinions but my oppinion for a 7.5mm id barrel would be 350mm to 450mm

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I put a random 375 into my he and it goes ok.

Well even

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