We have a large selection of 5.56 AR-15 Upper Receivers. A lot of people don’t know the difference between the 5.56 and .223 caliber. Any 5.56 Upper can shoot .223 caliber. But if it is labeled .223 caliber it should not be used with 5.56 caliber. Unless it is .223 wylde, then it can shoot 5.56. Annoying right? Don’t worry, all of our uppers are 5.56, so you don’t have to worry. If you combine a 5.56 Upper Receiver with Match Grade Quality Barrels, you’ll then be getting half inch groupings right out of the box! With some of the most Customizable 5.56 Uppers available online, we stock a large variety of colors. Our 5.56 Uppers come in M-LOK and KeyMod and in a variety of colors, from Magpul Flat Dark Earth, Anodized Red, NRA Blue, and Magpul OD Green. You can get a 5.56 Caliber AR-15 Custom Upper Receiver that is USA Made and at an affordable price. Combined with our superfast shipping, you will have a great experience shopping with Veriforce Tactical or your money back! We are your experts when it comes to all things AR-15, AR-308, AR 9mm, AK-47 and Sig MPX.