Building a standard AR-15 A2 Upper Receiver is quite simple. Watch Larry Potterfield, founder of MidwayUSA, demonstrate how it works. Starting with an explanation of the tools required, from the action blocks to a cylinder key, the use of each tool is explained in depth. Installation of the ejection port cover, forward assist, front and rear sights, and barrel are all covered. This build shows a demonstration of how to check clearances before installing the bolt and carrier. Then the delta ring is installed on the barrel and the barrel is attached to the upper receiver. Finally, the installation of the gas pipe and the compensator are described in detail.

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