DDM4®300 S (Factory SBR)

Out of stock
Starting at: $2,150.00


To purchase this firearm, contact your local Daniel Defense Dealer.

The DDM4 300S AR15 style rifle is designed for those demanding a high-performance, short-barrel rifle chambered in the versatile 300 Blackout cartridge. Built around a 10.3 inch barrel, the 300S uses standard 5.56 bolts and magazines to deliver .30 caliber projectiles with greater muzzle energy than comparable 5.56mm platforms. With a wide variety of factory ammunition made for everything from home defense, target shooting, hunting, suppressed operation, and tactical applications, the 300S is capable of delivering exceptional performance from a compact, fast-handling package. The independently ambi GRIP-N-RIP Charging Handle accommodates left- and right-handed shooters. This rifle also comes with the ergonomic Daniel Defense Buttstock and Pistol Grip.


This firearm is a regulated item by the National Firearms Act (NFA). Please check with your local and state municipalities for any further regulatory requirements. It is the buyer's responsibility to make sure he/she complies with all NFA rules and applicable laws.


  • LOWER RECEIVER: Mil-Spec with Enhanced Flared Magazine Well and Rear Receiver QD Swivel Attachment Point. CNC Machined of 7075-T6 Aluminum, Type III Hard-Coat Anodized
  • 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 Twist, 10.3" S2W Profile, Chrome Lined, Heavy Phosphate Finished, and HP/MPI Tested
  • GAS SYSTEM: Pinned Low-Profile Gas Block CNC Machined from 4140 Hardened Steel with Mil-Spec Heavy Phosphate Coating, Pistol Length, Direct Impingement
  • MUZZLE DEVICE: Daniel Defense Flash Suppressor, 17-4 PH Stainless Steel, Salt Bath Nitride Finished
  • BOLT CARRIER GROUP: M16 Profile, Mil-Spec MP Tested, Chrome Lined, Properly Staked Gas Key
  • BUFFER: H Buffer
  • SIGHTS: Sold Separately
  • HANDGUARD: Daniel Defense DDM4 Rail 9.0, CNC Machined from 6061-T6 Aluminum, Type III Hard-Coat Anodized
  • CHARGING HANDLE: GRIP-N-RIP Charging Handle, Body CNC Machined of 7075-T6 Aluminum, Handles & Latch CNC Machined of 6061-T6 Aluminum, Heavy Duty Stainless Steel Roll Pins, Type III Hard Coat Anodized
  • RECEIVER EXTENSION: Six-Position Mil-Spec 7075-T6 Aluminum
  • BUTTSTOCK: Daniel Defense Buttstock, Glass-Filled Polymer with Soft-Touch Overmolding
  • PISTOL GRIP: Daniel Defense Pistol Grip, Glass-Filled Polymer with Soft-Touch Overmolding
  • GRIP: Daniel Defense Vertical Grip, Glass-Filled Polymer with Soft-Touch Overmolding
  • RAIL PANELS: Daniel Defense Rail Panels made from Santoprene, Heat Resistant to 300° Fahrenheit
  • Made in the USA!


More Information
Mounting SystemPicatinny
Caliber300 BLK
Muzzle Thread5 ⁄ 8 × 24 TPI (Threads Per Inch)
Gas SystemPistol Length
Barrel Length10.3"
Barrel ProfileS2W® (Daniel Defense's proprietary Heavy Barrel)
Product Weight5.77 lbs
Length26 3/4"– 29 7/8”
MagazineMagpul PMAG 30 AR 300 B GEN M3
CaseDaniel Defense Full-Latch Impact Plastic Case
ManufacturerDaniel Defense
Daniel Defense Satisfaction Guarantee
Guaranteed Satisfaction

All Daniel Defense products carry a 100% satisfaction guarantee against defects in original materials and workmanship. If your Daniel Defense product shows evidence of such defects, Daniel Defense will make every accommodation to fix, repair, or replace your product in the most expeditious manner possible. Daniel Defense does not warranty products or damage caused to our products by the correct or incorrect installation of other manufacturer's products.

Customer Reviews
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  1. Pinnacle of Craftsmanship
    I have been shooting the M16/Ar15 platform for more than twenty years. This is my first SBR chambered in 300 Blackout, and my first experience with a Daniel Defense product. WOW, the DDM4300 is a beautifully crafted weapon. Outstanding performance, outstanding value.
    The gun shop I bought it from had already installed a Maxim Defense CQB stock and a threaded muzzle break. I installed a set of Griffon Armament Flip up BUIS, A Vortex SPARC II red dot, a Phase 5 over sized charging handle, Fortis fore grip, an Inforce weapon light on a Haley Strategic offset mount and a Blue Force Gear sling. Hornady Black 110gr V - Max seem to produce the best results for me. I have yet to mount a can so I cannot comment on subsonic loads.
    I have been operating this weapon for a couple of years now and its by far the finest AR I have ever owned. Its a pleasure to shoot and I imagine it will be a part of my personal load-out for many more years to come. Thank you Daniel Defense for your dedication to building some of the finest rifles on the planet. Semper Fi!!

    Review by

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  2. It is what I thought it would be.
    I love this gun. It does everything I had hoped it would do. Has room for my optics, light and BUSS. Would give it 5 * but the plastic ambidextrous selector and dust cover drop it down a star. Along with the charging handle (It could be bigger). Still a great gun.

    Review by

    Posted on

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