The upper receiver is the linchpin of your AR-15, anchoring the barrel, bolt carrier group (BCG), and optics into a unified system. Whether you’re slapping a pre-assembled complete upper receiver onto your lower or starting from a bare-bones stripped upper receiver to build your dream rifle, your choice here shapes everything—accuracy, reliability, and even how … Continue reading What to Look for in an AR-15 Upper Receiver: Complete Uppers and Stripped Options Explored