Daniel Defense Daniel Defense, DDM4 300 S, Complete Upper, 300 Blackout, 10.3 Cold Hammer Forged Barrel, 1:8 Twist, Black Finish, Includes Flash Suppressor, Grip-N-Rip Charging Handle 23-088-19020-047 High quality components and precise manufacturing makes Daniel Defense Products ideal for both new shooters and experienced gun owners. The durability, reliability and excellent build quality will provide years of service you can count on.