BEST 9MM AR UPPER RECEIVER OPTIONS FOR BUILDING A RELIABLE PCC

  Building a 9mm pistol-caliber carbine (PCC) is easier than ever, especially when you start with a quality 9mm AR upper receiver. Whether you're a weekend range shooter, tactical enthusiast, or clone builder, the upper receiver is the backbone of your AR. It determines accuracy, function, and overall feel. In this guide, we’ll look at