You can argue on iron sights vs MOS; caliber, and most effective EDC firearm. Here are some facts to help you decide: In most gunfights average number of rounds fired is 3.59 using a 9mm from an average distance of 3-6 feet as the deadliest distance for police. In a study experts were only 10% more accurate than novices from 3-15'. Thus, most shooters will hit their target when under 6 feet, regardless of ability. If you stand to shoot, your chances of being hit are 85% vs 47% when shooting while moving. During a five year period more police officers assaulted with knives (12.7%) vs firearms (9.3%). Police were, on the average, only 17% effective in shootouts. These studies from Force Science Institute and the Ohio State Police Academy. 34% of the time, simply brandishing your gun ended the fight before shots fired. However, do you want to rely only on statistics? Average 4 rounds, but what about the assailant wielding a knife that took 6 rounds of .357 before being stopped? And how accurate are you beyond 15' under stress? More is probably better than not enough.