What's in the Box Diamondback DB15 5.56 Nato AR Pistol with 7" Barrel 300 Blackout 10" Barrel (1) 30 Round Magazine Owner's Manual The Diamondback DB15 Sports South Exclusive features a 7" 5.56 NATO (1/2"x28) heavy, threaded Chrome Moly Vanadium barrel and an additional 10" 300 AAC Blackout (5/8"x24) barrel both with A2 flash hiders; M-LOK handguard; Picatinny rail; SB Tactical SBA3 brace and Magpul MOE K2 Grip; Includes 30rd Magpul Gen3 PMAG MCT. Firearm Features A2 Flash Hider Muzzle M-LOK Handguards Magpul Gan M3 PMAG SB Tactical Brace Heavy Threaded Barrel Mil-Spec Trigger Firearm Specifications Manufacturer: Diamondback Model: DB15 Caliber: 5.56 Nato; 300 Blackout Barrel Length: 7"; 10" Overall Length: 23"-28.5" Twist Rate: 1:8" RH Finish: FDE Sights: None; Picatinny Rail Grips: FDE Magpul Stock: FDE SB Tactical Brace Magazine Capacity: 30+1