Having two dedicated rifles is certainly an option, and if you want to get the absolute best performance from each specialized set-up, that is probably the way to go. Maybe you’d like a 5.56 NATO upper with iron sights for plinking and target shooting, and a suppressed 300 Blackout upper with a 1-6X variable zoom optic for hunting. Perhaps you’d like a few options in alternate calibers, with different gas systems, different barrel lengths, or different optics. Meaning you only have one serialized firearm. You can assemble a variety of upper configurations and use all of them with the same lower. This means you can purchase the upper and have it shipped right to your door, no FFL transfer and no paperwork. The upper contains the bolt carrier group, and is the half of the AR-15 the barrel attaches to, so making the right selection of upper parts to match your desired performance is critical.Ī significant advantage of the upper, unlike a lower receiver, is it's not considered a firearm by the Bureau of Alcohol, Tobacco, and Firearms. While the lower is the half of the rifle that’s considered the firearm, and therefore gets a lot of attention, the components that most largely determine the performance of the rifle reside with the upper. The AR-15 is a rifle comprised of two halves the upper and lower mated together, each responsible for their own essential functions.
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