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How do you make your own barrel, I have access to a lathe. And know how to operate it and also a 16" INCH BARREL. Need specs for an m4 profile
 

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Gunmakers and barrel makers use specialized tooling to bore the bore, and then rifle it. Takes more than standard machine tools. You will also need a barrel straightener after it is rifled. Stresses induced in rifling usually cause a wonky barrel that is cured by bending slightly.
 
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