Building and Shooting a 40 Cal AR Upper
If you're looking to change things up from the usual 9mm builds, grabbing a 40 cal ar upper is one of the most interesting ways to diversify your safe. For a long time, the .40 S&W was the king of the law enforcement world, but then it kind of fell out of favor as 9mm ballistics improved. However, that doesn't mean the cartridge is dead—far from it. In the context of a Pistol Caliber Carbine (PCC), the .40 S&W actually makes a ton of sense, offering a bit more "thump" than a 9mm without the massive bolt thrust and bulk of a .45 ACP. ...