Try These Popular Upper Receivers for the AR 15

For those who are interested in the AR 15, but not all that familiar, there are a few things to keep in mind. The AR 15 consists of a lower and an upper receiver. The lower receiver includes the trigger, stock, and some of the firing mechanisms. What makes the AR 15 special is that a full upper receiver of any compatible caliber can be mated to the lower receiver. So with one rifle, the upper receiver and magazine can be swapped out to fire a variety of cartridge calibers. That means you can go from shooting modest 22 LR cartridges from your AR 15 to shooting massive 458 SOCOM or 50 Beowulf cartridges. The following are a selection of calibers and associated upper receivers that you should consider if you own or wish to buy an AR 15.