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If you are concerned about over-penetration, your AR-15 is actually a better choice than your Glock 22.

223 was even less prone to over-penetration than 12-gauge buckshot.

Real-world testing has corroborated this theory, and in some tests. Because the 55-grain bullet is so much lighter than the 115- or 124-grain bullets typical of 9MM cartridges, the bullet will lose velocity much faster once it hits a solid or semi-solid object. The reason why is because of the lighter weight of the bullet. 223 than it is with a typical handgun round. ​Pro #2: Less over-penetrationĪt this point, many people will protest “But what about over-penetration? It's just that added speed and power that makes a rifle a bad choice for home defense!” Over-penetration is a possibility, regardless of the round you are firing, which is why it is always so important to observe Universal Firearms Safety Rule #4: Be sure of your target, and what is in line with your target (including behind the target).Īctually, and perhaps counter-intuitively, over-penetration is less of a problem with. 223 round from an AR will continue to pose a threat, it's far less likely than with a handgun. While it's possible that someone shot a time or two with a. There are ample cases of someone being shot multiple times with a 9MM or 45ACP and continuing to fight. That's over 3 times as much punch, and is more than sufficient to deliver fight-stopping hits to an assailant. That round will leave the muzzle at around 3200 fps, delivering 1250 ft-lbs of energy. 223 Remington cartridge, typical in an AR-15.

That's plenty of punch, but it pales in comparison to an average 55-grain. If we look at the stats of a typical 9MM 124-grain FMJ, we find that the muzzle velocity of a typical round is around 1100 feet per second (fps), delivering energy of around 340 foot-pounds (ft-lbs). The bottom line, however, is that handguns, regardless of the cartridge they fire, are not particularly powerful when compared to a rifle or shotgun. There is a great deal of debate about the relative merits of various calibers, particularly when discussing handguns.