The AR-15 platform has been a staple in the world of firearms for decades, cherished for its versatility, modularity, and ease of customization. One of the most intriguing additions to the AR-15 family in recent years has been the 300 AAC Blackout cartridge. Developed to bridge the gap between the 5.56 NATO and larger-caliber rounds, the         300 blackout upper offers shooters an impressive...