Smith & Wesson M&P Shield 40 S&W to 9mm Conversion Overview (HD)
This guide details the process of converting a Smith & Wesson M&P Shield from .40 S&W to 9mm by swapping the barrel and magazine. The video, presented by Mrgunsngear, demonstrates that a 9mm barrel fits into a .40 S&W slide, though with minor play at the barrel hood. The conversion is presented as a cost-effective modification, with conversion barrels typically costing around $100.











