The Bolt Carrier Group (BCG) is the quintessential component in the rifle's assembly, which is responsible for loading rounds into the chamber, firing those rounds, extracting and ejecting the spent casings, and operating the hammer to repeat the firing process. This component is subject to extreme pressure and high temperatures, so choosing a BCG that's produced using the highest quality materials and innovative design is important in ensuring your AR-15 not only performs with precision in high-pressure situations but also continues functioning reliably for many years to come.Building your own AR-15 or similar rifle involves learning about the function of each group of components. Serving as the heart of your rifle is the bolt carrier group. The bolt carrier group is comprised of multiple parts and is essential to your rifle assembly, as it allows the completion of a full cycle when you shoot. Choosing a bolt carrier for your build means deciding between several finishes, calibers,...