The DD5 V4 Upper Receiver Group, chambered in 7.62x51mm NATO, provides users of the Daniel Defense semi-automatic platform even greater long-range precision shooting capability. Whether you want to upgrade your DD5 V1 or V2, or have an alternative caliber option for your V3, V4 or V5. This highly accurate and durable upper includes an adjustable gas block that allows for a consistent feel whether shooting suppressed or unsuppressed. The perfected bolt carrier group reduces overall recoil impulse and is easy to maintain and operate in all conditions. Caliber: 7.62mm NATO / .308 WinchesterMounting System: M-LokGas System: DI Rifle LengthBarrel Length: 18" Cold Hammer Forged 1/10 Twist w/ Superior Suppression DeviceBarrel Profile: S2WProduct Weight: 6.2 lb