Even though the majority of AR builds in this country are chambered around 5.56 (or perhaps .223 or .223 Wylde) there is a growing portion of shooters that are enamored with alternative cartridges. One of these is .300 Blackout, which offers some serious advantages over the former two.

This post will look at some of the reasons that a .300 Blackout built kit might offer you more value than a completed rifle, as well as where the cartridge wins out over 5.56.

Why, when you can simply buy a complete assembled upper (and with no FFL transfer at that) would you ever buy an AR15 upper build kit, especially since assembling the rifle from one will take so much more time and effort?

There are some good reasons. Let’s break this all down.

AR builders, especially AR pistol builders, are obsessed with short, small, lightweight builds. But there may be times when you’re not satisfied with the small stature of your ARP even if you started with a small upper like a 5 inch AR pistol upper. 

For builders of sporting rifles, there are two main avenues you can take when it comes to choosing an upper. You can buy a stripped upper and then all the other parts separately, or you can buy an assembled upper, which will come with the vast majori

Those obsessed with micro AR pistol builds are always looking for ways to make their platforms smaller and lighter. This short post will help directly with that. With no further ado let’s get into it. Start with a Micro AR Upper Step number one is to