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Make: Ambush Firearms (Lower), Unmarked / No-Name (Upper & BCG)
Model: AF4
Serial Number: AF4002571
Year of Manufacture: Modern
Caliber: 5.56 NATO / .223 Rem
Action Type: Semi-Automatic, Direct Impingement, Magazine Fed
Markings: The left side of the lower receiver is marked “Ambush Firearms / BLACK CREEK, GA / USA / MODEL AF4 / CAL: MULTI / AF4002571”. The right side has selector markings “SAFE” and “SEMI”. The upper receiver, bolt, and carrier group are unmarked. The M-LOK handguard has no visible brand markings.
Barrel Length: 16”
Sights / Optics: There are no sights installed. The flat-top upper receiver and M-LOK handguard have full-length Picatinny rail sections for mounting optics or iron sights.
Stock Configuration & Condition: This rifle is built with a gray anodized Ambush Firearms lower and an unmarked black upper receiver. It features a free-float M-LOK handguard with top rail and M-LOK slots at 3, 6, and 9 o’clock. The buttstock is a minimalist skeletonized metal design, adjustable for length of pull on a carbine buffer tube. The pistol grip is black polymer with molded texturing. The furniture shows only light signs of handling and rates in Fine-Excellent condition overall.
Type of Finish: Gray Anodized (Lower), Matte Black (Upper & Components)
Finish Originality: Original
Bore Condition: The bore is bright, the rifling is sharp. There is no visible erosion in the bore. In this writer’s opinion, the bore rates 10/10.
Overall Condition: This rifle retains about 95% of its original finish. There is minor operational wear around the shell deflector, charging handle, and bolt raceways. The upper and lower receivers show a color mismatch but fit tightly with no excess play. The A2-style birdcage flash hider is clean. The screw heads are sharp and all receiver markings are clear. This rifle rates in about Fine-Excellent overall condition.
Mechanics: The action functions correctly. The trigger, safety selector, charging handle, and bolt release all operate smoothly. The metal buttstock adjusts securely with minimal play. As with all used firearms, a thorough cleaning may be necessary to meet your maintenance requirements.
Box, Paperwork & Accessories: None.
Our Assessment: This rifle blends a Daniel Defense-built Ambush Firearms lower with a no-name upper and component set for a reliable, field-ready AR-15 with modular potential. The Ambush brand was introduced as Daniel Defense’s answer to the hunting market—prioritizing accuracy, weight savings, and smooth handling over tactical flair. Their AF4 lowers are rarely seen today and serve as a solid foundation for a practical and dependable build.
The upper is unmarked and appears to be a quality mil-spec-style unit fitted with a free-float M-LOK handguard and A2-style flash hider. Inside, the bolt and carrier are likewise unmarked but appear serviceable and clean. The adjustable skeletonized stock rounds out the build with a minimalist footprint suitable for field carry or range work.
Whether you're chasing coyotes, tuning up for carbine courses, or just looking for a unique, lightweight AR with a Daniel Defense pedigree on the lower, this rifle is a great foundation. It’s a no-nonsense shooter with room to grow, and it’s ready for action right out of the gate.