Daniel Defense M4 URG M4A1 FSP

Product Description

The Daniel Defense M4 URG M4A1 FSP is a complete upper receiver group built for shooters who value proven, traditional M4 ergonomics. This configuration combines a short barrel with a fixed front sight post gas block profile. That design choice gives you the classic M4 silhouette that works with standard front sight tools.

Every Daniel Defense upper receiver ships hand-assembled, quality-assured, and test-fired. The pinned SureFire SF3P flash hider serves double duty: it hides muzzle flash and accepts SOCOM-spec suppressors. Your 5.56 NATO round pairs perfectly with this gas system for reliable function across training, duty, and sport shooting.

Built for Precision and Compatibility

This upper installs on any mil-spec AR-15 lower receiver. The fixed front sight post integrates seamlessly with standard accessory rails and optic mounts. You get a complete, field-ready upper that needs only a lower to run.

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: 14.5″ M4 Profile, Chrome Moly Vanadium Steel, Cold Hammer Forged, 1:7 Twist, Chrome Lined, Mil-Spec Heavy Phosphate Coated, HP/MPI Tested
• Gas System: Mil-Spec F-Marked Front Sight Base, Carbine-Length, Direct Impingement
• Muzzle Device: SureFire SF3P Flash Hider / Suppressor Adapter, Machined from US Mill-Certified Heat-Treated Stainless Steel Bar Stock, Black Ionbond DLC Coating, Pinned
• Handguard: Daniel Defense M4A1 FSP RIS II, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized FDE, Picatinny Top Rail with KeyMod at 3/6/9 o’clock
• Bolt Carrier Group: M16 Profile Bolt Carrier Group, Mil-Spec MP Tested, Chrome Lined, with Properly Staked Gas Key
• Charging Handle: Daniel Defense 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
• Rail Panels: Daniel Defense Rail Panels, Santoprene, Heat Resistant to 300°F

Specifications

This upper ships with a barrel measuring under 16 inches. Installing it on a rifle-configured AR-15 lower receiver would create a Short-Barreled Rifle (SBR), which is regulated under the National Firearms Act. Buyers who plan to build this into a rifle-configured firearm should first submit ATF Form 1 and obtain an approved tax stamp, or install it on a pistol-configured lower consistent with current ATF rules. Western Sport cannot advise on individual compliance — buyers are responsible for following all applicable federal and state law.

Why Buy from Western Sport?

• Western Sport employs knowledgeable staff who specialize in Daniel Defense builds and custom AR platforms.
• We deliver competitive pricing on all Daniel Defense complete upper receiver groups and components.
• Every purchase includes expert guidance on upper-to-lower compatibility and proper assembly.
• Our after-sale support ensures your Daniel Defense investment performs reliably for years.
• Local inventory means fast shipping and zero hassle returns on quality optics and parts.

Frequently Asked Questions

Q: What ammunition performs best with the 5.56 NATO M4A1 upper?

A: Standard 5.56 NATO and .223 Remington ammunition both function reliably in this upper. For precision work, match-grade 5.56 NATO loads deliver superior accuracy. For training and duty use, quality brass-cased or steel-cased loads work equally well.

Q: Will this upper fit my existing AR-15 lower receiver?

A: Yes, this complete upper receiver group installs on any mil-spec AR-15 lower without modification. The fixed front sight post and receiver extension are standard mil-spec dimensions. Always verify your lower’s caliber marking and condition before assembly.

Q: Does Daniel Defense offer other M4 upper configurations if I want different features?

A: Daniel Defense produces multiple complete upper receiver group variants with different handguards, rail systems, and gas block styles. Contact Western Sport to discuss which configuration matches your intended use and budget.

Q: What exactly comes with a complete upper receiver group versus a bare upper?

A: A complete upper receiver group includes the receiver, barrel, gas tube, bolt carrier group, and handguard fully assembled. A bare upper is only the receiver and handguard. This complete unit ships ready to install on your lower—no additional gunsmithing required.

Q: What is the RIS II rail system on this upper?

A: The RIS II (Rail Interface System II) is Daniel Defense’s free-float quad-rail handguard. It features a continuous top Picatinny rail for optics and sights. Additionally, KeyMod slots at the 3, 6, and 9 o’clock positions let you mount lights, lasers, and grips exactly where you need them.

Q: Do I need NFA paperwork for this upper?

A: It depends on your lower receiver. Installing this upper on a pistol-configured lower with no stock keeps the build classified as a pistol. However, installing it on a rifle-configured lower, or adding a stock, creates a short-barreled rifle and requires an approved ATF Form 1 first.

Also in the M4A1 Family

DD DD4 M4A1 RIII 556NATO 14.5″PB 32R  •  DD M4A1 556NATO 14.5″PB BLK/FDE 32RD  •  DD DD4 M4A1RIII 223/556 14.5P B5  •  DD DD4 M4A1 RIII 556NATO 14.5″PB 32R  •  DD M4A1 556NATO 14.5PB BROWN 32RD  •  DD M4A1 556NATO 14.5″PB FDE 10RD CA  •  Daniel Defense M4A1 Rifle  •  Daniel Defense M4 URG M4A1  •  Daniel Defense M4A1 RIII URG Black  •  Daniel Defense M4A1 RIII Rifle 14.5 inch Black

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Additional information