STT Everything But Lower Complete Upper 5.56 NATO 10.5"

The STT Everything But Lower is a complete AR-15 upper receiver kit chambered in 5.56 NATO, built around a 10.5" barrel. This compact pistol-length configuration delivers reliable performance in a lightweight package suitable for close-quarters applications. The complete upper assembly includes barrel, gas system, handguard, and upper receiver, providing everything needed except the lower receiver assembly.