Understanding How AR15 Uppers Work and Why You Need One
AR-15 upper receivers, more commonly called ” AR-15 uppers,” refer to the upper half of the rifle. The upper contains the key components of the AR-15 rifle. The four main receivers are known as the A1, A2, A3 and A4 upper receiver, respectively. These receivers are named in the same way the military designated their … Read more “Understanding How AR15 Uppers Work and Why You Need One”
