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Daniel Defense  |  SKU: RSR-DD23-088-19020-047

Daniel Defense - DDM4 300S Upper Receiver 10.3" 300 BLK

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Description

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.

NFA DISCLAIMER: 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 they comply with all NFA rules and applicable laws.

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
  • Material: Chrome Moly Vanadium
  • Manufacturing Process: Cold Hammer Forged
  • Twist Rate: 1:8
  • 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

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Frequently Asked Questions

What are the primary uses for the DDM4 300S Upper Receiver?

The DDM4 300S Upper Receiver is designed for a variety of applications including home defense, target shooting, hunting, and tactical operations. Its compact 10.3-inch barrel and compatibility with the 300 Blackout cartridge make it suitable for both suppressed and unsuppressed firing. This versatility allows it to deliver greater muzzle energy compared to standard 5.56mm platforms, making it a powerful choice for those who need a compact yet effective firearm solution.

Is the DDM4 300S Upper Receiver compatible with my existing AR-15 lower receiver?

Yes, the DDM4 300S Upper Receiver is compatible with standard AR-15 lower receivers. It uses standard 5.56 bolts and magazines, which means you can easily integrate it with your current setup without requiring specialized components. However, it's important to ensure that your lower receiver is compliant with local and federal regulations, especially since this upper receiver falls under NFA regulations.

What are the advantages of using the 300 Blackout cartridge with this upper receiver?

The 300 Blackout cartridge offers several advantages when used with the DDM4 300S Upper Receiver. It provides greater muzzle energy and effectiveness at short to medium ranges compared to the 5.56mm. Additionally, it is designed to perform well in both suppressed and unsuppressed conditions, making it a versatile choice for various tactical and defensive scenarios. This flexibility is particularly beneficial in urban environments where space is limited and noise suppression is a priority.

What kind of maintenance does the DDM4 300S Upper Receiver require?

Regular maintenance of the DDM4 300S Upper Receiver involves cleaning and lubrication to ensure optimal performance. The chrome-lined barrel and bolt carrier group should be cleaned after each use to prevent fouling and corrosion. Properly staking the gas key and ensuring the gas system is free of obstructions are also critical. For detailed maintenance tips, refer to guides on firearm cleaning and maintenance, such as those found in our Tools & Cleaning Equipment collection.

Can the DDM4 300S Upper Receiver be used for hunting?

Yes, the DDM4 300S Upper Receiver is suitable for hunting, especially for game that requires more stopping power. The 300 Blackout cartridge is effective for hunting medium-sized game due to its enhanced energy delivery. However, hunters should be aware of local hunting regulations regarding caliber restrictions and ensure that they comply with all legal requirements. Additionally, the compact size of the upper receiver makes it ideal for maneuvering in dense brush or wooded areas.

What should I consider when using this upper receiver for home defense?

When using the DDM4 300S Upper Receiver for home defense, consider the balance between power and maneuverability. The compact design allows for easy handling in confined spaces, while the 300 Blackout provides sufficient stopping power. It's crucial to practice regularly and understand the firearm's operation under stress. Additionally, consider integrating a tactical light or red dot sight for improved target acquisition in low-light conditions. For more on tactical gear, explore our Tactical Lighting & Lasers collection.

Is the DDM4 300S Upper Receiver suitable for suppressed shooting?

Yes, the DDM4 300S Upper Receiver is designed to work well with suppressors. The 300 Blackout cartridge is particularly effective in suppressed configurations due to its subsonic ammunition options, which significantly reduce noise. This makes it an excellent choice for tactical operations or home defense scenarios where stealth is necessary. Ensure that any suppressor used is compatible with the upper receiver and complies with all applicable laws and regulations.

What are the legal considerations for owning the DDM4 300S Upper Receiver?

The DDM4 300S Upper Receiver is subject to NFA regulations due to its short barrel length. This means you must comply with federal and state laws regarding short-barreled rifles (SBRs). Before purchasing, you should check with local authorities and ensure you have the necessary paperwork, such as a tax stamp, to legally own and use this upper receiver. Ignorance of these regulations can result in severe legal consequences.

How does the GRIP-N-RIP Charging Handle benefit shooters?

The GRIP-N-RIP Charging Handle is designed for ambidextrous use, accommodating both left- and right-handed shooters. This feature enhances the versatility and usability of the DDM4 300S Upper Receiver, allowing for more efficient operation under various conditions. It is particularly beneficial in tactical situations where quick and reliable access to the charging handle is critical. The robust construction ensures durability and performance even in demanding environments.

What kind of ammunition is recommended for the DDM4 300S Upper Receiver?

The DDM4 300S Upper Receiver is compatible with a wide range of factory ammunition designed for the 300 Blackout cartridge. For optimal performance, you can use both supersonic and subsonic rounds, depending on your specific needs. Supersonic rounds are ideal for situations requiring greater range and power, while subsonic rounds are preferred for suppressed shooting to minimize noise. Always ensure that the ammunition you choose is of high quality and appropriate for your intended use.