S&W M&P Shield 2.0 45ACP upgrades! MCARBO spring kit, polishing, drifting sight… is it fixed?
This guide details the process of upgrading the Smith & Wesson M&P Shield 2.0 in 45 ACP by installing an MCARBO spring kit and performing polishing on key internal components. The objective is to significantly reduce trigger pull weight and improve overall firearm accuracy. The process also includes adjusting the rear sight to correct leftward shooting tendencies.












