Ballistic Advantage Logic Series, M-LOK Rail, Fits AR15, 15, Anodized Finish, Black BALG00005 Welcome to the new standard of rail system in the Ballistic Advantage Logic Handguard. Ballistic Advantage believes that the customer's ability to customize their handguard with any accessory they want" wherever they want" is extremely important; the Logic Handguard does just that. A full top picatinny and seven sides of M-LOK allows for as many options as possible when it comes to attachments and accessories.