Two of the more popular calibers for AR-style rifle builds are 5.56 NATO and .300 Blackout.

They are also fairly similar calibers but quite distinct with respect to the relative advantages and disadvantages they offer.

It is likely the case that most AR-style rifles are built around the 5.56 NATO cartridge, following in the footsteps of the United States military’s use of the cartridge.

But it is also the case that there are tons of other parts for AR-style rifles that are not backformed around this limitation.

A micro AR pistol, like a 5 inch AR pistol, on the extremely small end, can be an excellent investment. This is particularly true if you’re looking to buy (or build) a gun that offers any of the following. Let others keep their rifles. A micro AR pis

You probably didn’t need to be convinced to build with a 5.56 upper since the vast majority of AR-style rifles out there are. But just on the off chance that you’ve been wooed by some other cartridge and are looking for a vehement defense of old reli

Probably the two main common sizes in AR uppers are 16 and 20 inch AR uppers. These offer unique benefits and confer distinct advantages to the operators of builds completed with them. Here’s a little more about what you should know about these upper