The Spikes Tactical STU5025R9S Complete Upper delivers a rugged 5.56x45mm NATO platform with a 16" chrome moly barrel finished in black phosphate, paired with a 7075-T6 aluminum black receiver for durable, field-ready performance. This complete upper features a 9" BAR2 free-float handguard in black, providing a lightweight, rigid mounting surface that maintains slim profile and excellent heat management during extended sessions. With an optic-ready design and sights not included, it offers a clean platform for custom optics setups or iron sight configurations tailored to your preferred shooting style. The 1:7 twist rate supports a wide range of standard and mid-weight 5.56 ammunition, delivering consistent accuracy across typical duty, sporting, and tactical engagements. The combination of a robust upper assembly, aerospace-grade receiver, and a precision-lapped finish ensures reliable cycling and enduring corrosion resistance in diverse environments. Whether upgrading an existing M4 carbine or building a reliable rifle-ready upper from the ground up, this Spikes Tactical complete upper integrates seamlessly with compatible lowers, delivering versatility, repeatable performance, and a practical balance of weight and strength for field use, range days, and training scenarios.