The DDM4 300S AR15 style Upper Receiver Group 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 Upper Receiver Group 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, this upper receiver group 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. All Daniel Defense complete upper receiver groups come standard with an M16 profile bolt carrier group.
MATERIALS & CONSTRUCTION
- 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, Pistol Length Gas System, Chrome Lined, Mil-Spec Heavy Phosphate Coated, and HP/MPI Tested
- GAS SYSTEM: Pinned Low Profile Gas Block CNC Machined of 4140 Hardened Steel and 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
- 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 7076-T6 Aluminum, Handles & Latch CNC Machined of 6061-T6 Aluminum, Heavy Duty Stainless Steel Roll Pins, Type III Hard Coat Anodized
- RAIL PANELS: Daniel Defense Rail Panels Made from Santoprene, Heat Resistant to 300° F
- Made in the USA!
SPECIFICATIONS
| Mounting System | Picatinny |
|---|---|
| Caliber | 300 BLK |
| Gas System | Pistol Length |
| Barrel Length | 10.3″ |
| Barrel Profile | S2W® (Daniel Defense’s proprietary Heavy Barrel) |
| Product Weight | 3.65 lbs |
| Manufacturer | Daniel Defense |
3 reviews for DDM4®300 S Upper Receiver Group
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George –
I got a DD 10.3 Tactical Law 5.56 and was so impressed I just had to buy another DD rifle/pistol but in these days and times that’s hard to do with as soon as DD puts available they get purchased and I get it. Ordered this barrel and also a DD lower kit and pared with Rainier Arm lower. It’s a match made in heaven looking at my DD and then my DIY AR it’s hard to tell apart.
John The Closer –
Simply love Daniel Defense products! I own the V9, Two MK18’s, V7P, and Now the 300 S SBR. I hope to make a Black Creek visit soon. Could I get a tour? Hands down the best firearms on the market. Keep up the great work DD.
Brandon –
Got the chance to try out a DD at a gun range, went to my local store and found this upper. Great product