300 Blackout Lower: Is it the Same as a 5.56? A Complete Guide
Understanding the AR-15 Foundation Components and Roles To fully grasp the relationship between 300 Blackout and 5.56 components, it’s essential to understand the AR-15’s modular design. The AR-15 is built around two primary components: the upper receiver and the lower receiver. The lower receiver acts as the core, the foundational unit that houses the essential … Read more