Daniel Defense DDM4 PDW, Semi-automatic SBR, 300 Blackout, 7 Cold Hammer Forged Barrel, 1:7 Twist, Black Finish, Maxim Defense CQB Gen 7 Stock, Grip-N-Rip Charging Handle, Linear Compensator, 30Rd 02-088-22220-047 Compact and easy to transport, the Daniel Defense DDM4 PDW Short Barrel Rifle is the kind of firearm you can rely on for home and personal defenseplus it's a ton of fun to shoot. The 7" 300BLK cold hammer forged barrel keeps subsonic loads subsonic and provides great ballistics for a shorter barrel.