F-1 Firearms UDR-15-3G .223 Wylde AR-15, 16 in Diamond-Fluted Stainless Barrel, Skeletonized Billet Receivers, Ambi Controls
The F-1 Firearms UDR-15-3G stands out with its skeletonized billet receivers, diamond-fluted 16-inch stainless barrel, and premium F-1 components throughout. A free-float F-1 handguard with a continuous 1913 Picatinny top rail and an extended ambidextrous charging handle highlight its competition-focused design. Chambered in .223 Wylde and built in the USA, this rifle blends distinctive styling with practical, high-end features.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are markings from previous handling and use. The bolt catch does not function properly. Please refer to the photos for a closer look at the cosmetic details.
What’s Included
- F-1 Firearms UDR-15-3G .223 Wylde rifle
- One 30-round Magpul PMAG Gen M3 windowed polymer magazine
This UDR-15-3G features skeletonized billet upper and lower receivers with elongated oval ports, delivering a distinctive look and reducing material where possible. Forward-assist configuration may vary by build, and the ejection-port dust cover is intentionally omitted. The matte black finish on the receivers and furniture provides a cohesive, purpose-built appearance.
The free-float F-1 handguard carries the F-in-shield logo and a continuous 1913 Picatinny top rail for mounting. The design keeps weight forward of the receiver minimal while maximizing accessory rail space along the top.
Its 16-inch stainless steel barrel is diamond-pattern fluted and threaded, capped with a three-port side-baffled muzzle brake. The rifle is chambered in .223 Wylde, balancing precision potential with broad ammunition compatibility in this chambering class.
Controls and internals are refined with an extended ambidextrous F-1 charging handle and an ambidextrous safety selector. A gold-colored, F-1-marked bolt carrier group is visible through the receiver ports, adding both visual contrast and a hallmark F-1 detail.
Furniture includes the Mission First Tactical Battlelink Minimalist adjustable carbine stock and a skeletonized pistol grip wrapped in paracord. The platform is AR-15, direct impingement, with a stated 30+1 capacity and an 11.0-inch length of pull at its referenced setting. No sights are installed.