The beauty of the AR platform is its modularity, which comes down to its two-part receiver construction. Why, I have one lower receiver right now that sports different upper receivers at different times depending on the situation.
The Benefit of Upper Receivers
My setup includes one with a 20-inch, stainless steel barrel chambered in 6.8 SPC; another in 300 Blackout because it is my new deer-hunting caliber; and when I’m not in the woods, the lower wears a mil-spec 5.56mm NATO upper with backup sights and a red dot for home defense.
Multiple calibers, same lower receiver. Want to get in on the act? Let’s look at some of the best new uppers available.
Scroll through our list of upper receivers below. For more, be sure to check out the manufacturers’ websites.
This article is the 2019 edition of Black Guns Magazine. Grab your copy at OutdoorGroupStore.com.