The most common barrel length for a 5.56 AR is 16 inches. Many special purpose rifles will use an 18”-20” barrel to achieve a good balance of velocity and handling, though these rifles can still feel unwieldy in a hallway. 300 Blackout, which excels in shorter barrel lengths.įor accuracy at further distances (or for hunting purposes), you’ll want the velocity and ballistic profile provided by a longer barrel. If you want a shorter AR, we recommend looking at a caliber like. Professionals favor 10”-12” barrels for many close-quarters carbines, and you can replicate their performance with a similarly sized AR pistol. Some applications, such as home defense, favor a shorter barrel length so that you can clear doors and hallways with ease. There are a variety of reasons to consider various barrel lengths for your rifle. 6061-T6 aluminum will almost certainly be able to stand up to any demands you will be putting on your rifle, but understanding the differences is still better than being uninformed. This makes it easier to work with in the manufacturing process, but it is not as stress-resilient or as strong as 7075-T6 which can be as hard as steel. Some receivers you’ll find are made from 6061-T6 aluminum, which has less zinc in the alloy than 7075-T6. High tensile strength aluminum is the preferred construction material for AR-15 receivers, and it is generally accepted that 7075-T6 is the best aluminum for the task as it carries the MIL SPEC designation for the military’s M4 Carbine uppers and lowers. They come in a few different types of material and use different construction methods. While there are many versions of the AR-15 upper, the most commonly available version on the market today is the flat-topped A4-style upper that does not feature a carry handle. Many manufacturers offer a number of options when it comes to AR uppers, so what are the most important things to consider when choosing your next one? What makes a good upper receiver? But if you’re on a budget, or you just prefer to keep your trigger, stock, and all other factors consistent and have the flexibility of different calibers and set-ups, all you need is different assembled upper. 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. A shooter 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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