Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.
4140 Chromoly Steel or 416 Stainless Steel as provided by the barrel blank manufacturers. I use barrel blanks from companies like Douglas, Shilen and Krieger so I leave the choice of steel to these companies. They have much more experience in choosing the right material and heat treating for the job of making a barrel than you or I do.
