Radical Firearms RF-15 includes a series of AR-15 rifles with different barrel lengths, calibers, and configurations, offering options for various shooting applications, including target shooting, hunting, and self-defense. The RF-15 is typically chambered in 5.56 NATO, which allows for the use of both 5.56 NATO and .223 Remington ammunition. It is available in multiple barrel lengths to suit different preferences and shooting scenarios. Common barrel lengths include 16 inches, 14.5 inches (with pinned and welded muzzle device to meet legal requirements), and 10.5 inches for pistol configurations. The overall weight and length of the RF-15 can vary depending on the specific configuration and optional accessories, typically ranging from 6 to 7.5 pounds, and 32 to 36 inches. The RF-15's quality craftsmanship and attention to detail are the main reason for its popularity. It often incorporates a free-floating handguard, allowing for improved accuracy and increased accessory attachment points. The rifle may also include features like an adjustable stock, a reliable gas system, and a quality trigger for enhanced shooting performance.