This guide details the expert-level manufacturing process for Shilen Contour #4 Barrels, as explained by Steve Ostrem from Brownells. It covers the cold-forming technique, material options (Chrome Moly and Stainless Steel), stringent tolerances (.0005 inch groove, .0003 inch uniformity), and rigorous inspection methods using air gauges and bore scopes. The information is presented with high authority, reflecting deep technical knowledge in barrel production for custom firearms.
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