Daniel Defense DDM4ISR 300 | Outdoor Channel
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Daniel Defense DDM4ISR 300


The Daniel Defense DDM4ISR (Integrally Suppressed Rifle) 300 joins our family of precision-crafted M4 Rifles. The ISR takes advantage of the best characteristics of the 300BLK by integrating key components into one package, eliminating the need for two separate tax stamps. While the rifle utilizes a 10.3” barrel, it is not classified as an SBR (Short-Barreled Rifle) because the suppressor is permanently attached. The DDM4ISR 300’s sound suppressor is threaded and welded to the proprietary ISR Integrated Gas Block, bringing the barrel length to 16.145”. While the rifle is at the 16” legal limit, the ISR’s integrated suppressor will require an NFA tax stamp.

  • Lower Receiver: Mil-Spec with Enhanced Flared Magazine Well and Rear Receiver QD Swivel Attachment Point
  • Upper Receiver: Mil-Spec with Indexing Marks and M4 Feed Ramps
  • Barrel: 4150 Chrome Moly Vanadium Steel, Cold Hammer Forged, 1:8, 10.3″ S2W® Profile, Pistol-length Gas System, Salt Bath Nitride Finished, and HP/MPI tested
  • Chamber: 300 BLK
  • Gas Block: Daniel Defense ISR Integrated Gas Block
  • Suppressor: All Stainless Steel Construction, 17-4PH Monolithic Baffle, Salt Bath Nitride Finish, Pinned and Welded Assembly
  • Bolt Carrier Group: Mil-Spec MP Tested, Properly Staked Gas Key
  • Buffer: H Buffer
  • Sights: Sold Separately
  • Handguard: Daniel Defense Modular Float Rail 12.0
  • Rail Sections: 3 Picatinny Modular Rail Sections
  • Buttstock: MAGPUL MOE Buttstock & Mil-Spec Receiver Extension
  • Magazine: MAGPUL 30-round PMag®
  • Weight: 7.6lbs
  • Length: 31 ¼” Collapsed
  • Case: Comes with Custom Daniel Defense Full-Latch Impact Plastic Case

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