How physiological stress fundamentally degrades a shooter's accuracy and decision-making during high-pressure defensive situations. It explains that adrenaline triggers a shift from fine to gross motor skills, often leading to mechanical failures like trigger slapping and poor recoil management. Beyond physical control, the source highlights how sensory distortions, such as tunnel vision and time compression, prevent individuals from processing their environment effectively. To counter these effects, the author advocates for Force-on-Force training, which uses realistic scenarios to build stress inoculation. This specialized training aims to bridge the gap between static range practice and the complex realities of real-world encounters. 

https://valortec.com/why-stress-destroys-shooting-accuracy/