Try These Popular Upper Receivers for the AR 15

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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.
458 SOCOM

556 NATO

The original parent cartridges for the AR 15 are the 556 NATO military cartridge and its sibling civilian cartridge, the 223 Remington. You can shoot the 223 Remington with a 556 NATO receiver, but the reverse is not recommended. The 223 Remington is one of the most popular center fire rifle calibers on the market with a wide variety of available loads. Plus, the 556 NATO and 223 Remington are just great all-around cartridges.

204 Ruger

The 204 Ruger is among the highest velocity cartridges available. This “velocity king” is known for blistering speed, capable of surpassing 4,000 feet per second. The result is a bullet that flies very far, very flat, very fast. For long-range shooting, including varmint hunting, it is hard to beat the 204 Ruger.

50 Beowulf

It is fitting that this cartridge is named after the mythical figure because the 50 Beowulf is a monster. Originally developed for heavy-duty military use, the 50 Beowulf cartridge has since gained a significant following among civilian shooters and hunters. Due to its size and power, the 50 Beowulf has proven effective as protection against grizzly bears and for hunting any medium-to-large mammal in North America, from feral hogs and deer to moose and bears.

300 Blackout

The 300 Blackout is fast becoming one of the most popular calibers in the AR 15 family. Like the 556 NATO and 50 Beowulf, the 300 Blackout was originally developed by the military as a cartridge that offers solid performance at mid-to-short range. It is also a subsonic cartridge, making it an ideal candidate for use with a silencer. That combination has made it a favorite among feral hog hunters who appreciate reliable performance that can be suppressed to avoid scaring off game with a gunshot.

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