Due to its innovative baseplate, the Daniel Defense DD Magazine holds 32 rounds of .223 Rem or .300 Blackout ammunition despite being no longer than a standard 30-round AR-15 magazine. Built from a carbon fiber-reinforced polymer, the DD Magazine features a textured exterior for improved purchase and an anti-tilt follower. Price: $20. Contact: Daniel Defense Inc.; (866) 554-4867; danieldefense.com.