Spikes STU5435MLS | 5.56 NATO | 16in CHF Barrel

The Spikes Tactical STU5435MLS is a complete upper assembly for AR-platform rifles, supplied ready to install on a compatible lower. It is chambered for .223 REM/5.56 NATO and built around a 16-inch mid-length cold-hammer-forged barrel with a 1:7 rate of twist. The upper pairs a 7075-T6 aluminum black receiver with a 12-inch SAR3 free-floating handguard and A2 front sight for a durable, mil-spec compliant configuration.

Typical uses include range and training work and precision sighting or target practice where consistent barrel performance and ergonomics are important.

Product Specifications

• The product type is Complete.
• The model is STU5435MLS.
• The caliber/gauge is .223 REM/5.56 NATO.
• The barrel length is 16″.
• The barrel description is Mid-Length Cold Hammer Forged.
• The rate of twist is 1:7.
• The barrel finish is Black Phosphate.
• The handguards are 12″ SAR3 Free-Floating.
• The handguard finish is Black.
• The receiver material is 7075-T6 Aluminum.
• The fit is specified for AR Rifles.
• The gas system is Mid Length Gas System.
• The sights include a A2 Front sight base.
• Accessories include an A2 Flash Hider.
• The UPC is 815648023317.

This upper is supplied as a ready-to-install assembly for builders and shooters who want a durable, mil-spec style platform without assembling individual components. The cold-hammer-forged 16-inch barrel with a 1:7 twist supports a range of bullet weights commonly used in 5.56 NATO, while the free-floating SAR3 handguard delivers a stable mounting interface for optics and accessories. Overall, the STU5435MLS offers a straightforward, serviceable option for range-focused and precision-oriented AR builds.