[defender116]

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

 

[c3shooter]

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.

 

[Intheshop]

Pratt & Whitney "owns it",as far as I'm concerned.......and its most assuredly one of those,"if you gotta ask" sort of things,WRT $$$.Further reading below.

http://www.border-barrels.com/articles/bmart.htm