The Seekins SP10M .308 Win 18" Black Complete Upper is a ready‑to‑install upper receiver assembly that blends the proven .308 Winchester cartridge with a compact, versatile AR‑10 platform. With its 18" 1:8" barrel and free‑float SP3R M‑LOK handguard, the setup offers a balanced combination of maneuverability, accuracy and modern modular flexibility—making it well suited for tactical, range, or hunting applications. The complete upper includes the barrel, receiver, handguard, and gas system, and is compatible with standard AR‑10 / SP10 lowers and magazines, simplifying installation and build processes. With an approximate overall length around 54" and a reported unloaded weight near 11.6 lb (depending on configuration), this build remains manageable while delivering solid .308 performance. For shooters wanting a reliable, semi‑automatic platform that balances power, portability, and adaptability, this 18" SP10M Complete Upper is a compelling choice.