FN America M4 Carbine URG-I 5.56 NATO — Geissele Upper, Mk16 DDC Handguard, 14.5 in Pin & Weld to 16.5 in, SureFire SOCOM Flash Hider
This FN America M4 Carbine pairs an FN M4 CARBINE-marked lower with a Geissele URG-I–type upper for a refined, duty-style configuration. It features a Geissele Mk16 DDC free-float M-LOK handguard (NSN 1005-01-672-4797), a 14.5 inch barrel with a pinned and welded SureFire SOCOM flash hider/suppressor adapter bringing overall barrel length to approximately 16.5 inches, and a Geissele charging handle. Furniture includes a B5 Systems adjustable stock and Umbrella Corporation (UCWRG) grip in tan, with Magpul MBUS flip-up sights installed. Condition is excellent.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Shows little evidence of prior use or handling.
What's Included
- Magpul MBUS polymer flip-up front and rear sights (installed)
- Angled foregrip/hand stop (polymer, installed)
- Geissele Automatics free-float M-LOK handguard (installed)
- SureFire SOCOM-compatible flash hider/suppressor adapter (installed)
- B5 Systems adjustable carbine stock (installed)
- Umbrella Corporation (UCWRG) polymer pistol grip (installed)
- 1x Magpul PMAG 30-round magazine
The lower receiver is an FN America M4 CARBINE-marked unit from FN Columbia, South Carolina (MFG code 3S679), mated to a Geissele URG-I–type upper receiver. This pairing delivers a proven AR-15 platform with quality components throughout while maintaining a clean, factory-style presentation.
The Geissele Mk16 free-float M-LOK handguard in DDC carries NSN 1005-01-672-4797 and provides a continuous T-marked top rail for consistent mounting reference. Its free-float design helps keep the barrel isolated from handguard pressure and supports modern accessory placement along the M-LOK slots.
A 14.5 inch barrel is paired with a SureFire SOCOM flash hider/suppressor adapter that is permanently pinned and welded, bringing the barrel to approximately 16.5 inches overall length. This configuration preserves the handling of a 14.5 inch system while meeting the pinned-and-welded requirement. The rifle uses a semi-automatic, direct impingement operating system with a manual safety selector.
Ergonomics are well-sorted with a B5 Systems adjustable carbine stock and Umbrella Corporation (UCWRG) pistol grip in tan, complemented by Magpul MBUS polymer flip-up sights and an angled foregrip/hand stop. A Geissele charging handle rounds out the upper. Capacity is 30+1 with the included Magpul PMAG.
The receivers are aluminum with a black anodized finish, contrasting the DDC handguard and tan furniture for a functional two-tone look. Made in the United States, this build emphasizes quality components and a cohesive URG-I–style setup. Geissele Upper Receiver noted.
14.5 inch Barrel Pin & Welded bringing overall length to 16.5 inches.