Differences Between Cock on Open versus Cock on Close Actions | MidwayUSA Gunsmithing
Larry Potterfield, founder of MidwayUSA, provides an expert demonstration of the mechanical differences between 'cock on open' and 'cock on close' bolt actions. He uses Mauser 98 and Mauser 96 actions to illustrate how the mainspring is compressed during different phases of the bolt cycle, highlighting the historical prevalence of 'cock on close' in military rifles versus the modern 'cock on open' standard.











