However, the rear sight of the A2 is more advanced and is adjustable for elevation (generally up to 600 yards) as well as windage. As with the A1, the A2 is equipped with a fixed carry handle and a forward assist. The A2 upper was introduced as an upgraded version of the A1 in the early 1980s. In general, the AR-15 A1 upper provides accurate firing within approximately 450 yards. The rear sight is also equipped with short- and long-range apertures. There is also a flip rear sight that adjusts for windage, but not elevation. Key A1 features include a light profile barrel, forward assist and a fixed carry handle. Developed in the 1960s, the A1 was installed on the M-16 A1 rifles used by soldiers in the Vietnam War. The A1 is the original AR-15 upper receiver version. In this post, we will explore the various AR-15 upper receiver types, including the AR-15 A1, A2, A3 and A4. The AR-15 receiver consists of upper and lower portions - the latter of which is the legally controlled, serialized part. As with a chassis, all essential AR-15 parts are built onto the receiver. One way to gain a better understanding of what a receiver actually does is to compare it to the chassis of an automobile. If you are brand-new to the world of the AR-15 rifle, you may be confused about the many different AR-15 receiver types.
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