Daniel Defense DDM4ISR Upper Receiver Group

The Daniel Defense DDM4ISR Upper Receiver Group is optimized for the .300 Blackout cartridge. Built around a 9”, Cold Hammer Forged barrel that is fluted along with a target crown and a standard pistol length gas system, this versatile, high-performance URG accurately delivers both subsonic and supersonic projectiles downrange with unrelenting reliability. Because the suppressor is an integral part of the barrel, it is ready for service right out of the box. There’s no attaching a suppressor and wondering if it’s mounted correctly and/or properly aligned. There’s no re-zeroing for suppressed vs. unsuppressed fire.
The DDM4ISR’s integral suppressor extends the barrel to an NFA-required 16 inches in length. When attached to the lower, this platform is not classified as a Short Barreled Rifle (SBR) and therefore only requires a single tax stamp (for the suppressor). The suppressor’s lightweight outer tube is constructed of durable, heat-resistant metal alloys and coated with a protective high-temperature Cerakote-C finish, which is able of withstanding extreme temperatures and harsh environments. The suppressor is also user-serviceable, so its baffle core can be easily removed for periodic cleaning in order to maintain peak performance.
The DDM4ISR Upper Receiver Group comes standard with Daniel Defense’s MFR XL 15.0 modular handguard, which features a continuous 1913 Picatinny rail on its top, for the mounting of iron sights or optics, and Keymod attachment points on the sides and bottom.  The new independently ambi GRIP-N-RIP Charging Handle accommodates left- and right-handed shooters and is engineered for suppressed fire, with anti-gas features that redirect gas flow upward and away from the face and operator.  All Daniel Defense complete upper receiver groups come standard with an M16 profile bolt carrier group.
Technical Specifications:
Upper Receiver: Mil-Spec with Indexing Marks and M4 Feed Ramps. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized
Barrel: Chrome Moly Vanadium Steel, Cold Hammer Forged, 1:8, 9″ S2W Profile, Chrome Lined, and Mil-Spec Heavy Phosphate Coated
Integrated Suppressor: All Stainless Steel Construction, 17-4PH Monolithic Baffle, High-temp Cerakote-C Finish, Pinned and Welded Assembly
Gas System: Daniel Defense ISR Integrated Gas Block, Pistol Length, Direct Impingement
Bolt Carrier Group: M16 Profile, Mil-Spec MP Tested, Chrome Lined, Properly Staked Gas Key
Sights: Sold Separately
Handguard: MFR XL 15.0, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized
Charging Handle: GRIP-N-RIP Charging Handle, Body CNC Machined of 7076-T6 Aluminum, Handles & Latch CNC Machined of 6061-T6 Aluminum, Heavy Duty Stainless Steel Roll Pins, Type III
Finish: Hard Coat Anodized
Grip: Daniel Defense Vertical Grip, Glass Filled Polymer with Soft Touch Overmolding
Made in the USA!
What’s in the Box:
Daniel Defense DDM4 ISR Upper Receiver Group
Owner’s Manual