300 Blackout for more of a home-defense build. For instance, if the AR you originally bought had a 16” barrel, you might want to try an upper receiver that’s a little longer and, thus, more effective at long range, or shift from 5.56 NATO to.
In cases like that, it makes sense for someone to buy an upper to get what they need to get out of their rifle. Second, many folks find themselves in the position of already having either a complete lower or a rifle that they find no longer suits their needs. Starting with an upper of your choice, you can build an AR-15 that perfectly suits your vision and needs. These nuanced decisions make buying an upper receiver a popular option for folks who want control in the final product. Depending on the route you go, you get to choose the barrel, the look of the gun, as well as the type of operating system, and, ultimately, how the gun will handle. Many people buy an AR-15 upper receiver to build a new rifle the exact way they want it.
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