The Spikes Tactical ST-15 LE Complete Upper (brand part number STU5025-M4S) pairs the company’s fully mil-spec-compliant law enforcement upper line with a classic M4 Double Heat Shield Handguard for a traditional carbine profile. Built by Spikes Tactical, this 16-inch 5.56 NATO upper runs a 1:7 twist Mil-Spec barrel with an M4 profile, a carbine-length gas system, and an F-marked A2 front sight base on a .750-inch diameter gas seat. It ships complete with a Spike’s Tactical Mil-Spec M16 bolt carrier group and an A2 flash hider, ready for a lower and finishing parts.

Key Specifications

• Barrel length is 16 inches, chambered in .223 Remington/5.56 NATO.
• Twist rate is 1:7, built to Mil-Spec dimensions.
• Barrel profile is M4 with a black phosphate finish.
• Runs a carbine-length gas system with a .750-inch diameter gas seat.
• Includes a Spike’s Tactical Mil-Spec M16 bolt carrier group.
• Handguard is the classic M4 Double Heat Shield design.
• Front sight is an F-marked A2 front sight base.
• Fitted with a standard A2 flash hider muzzle device.
• Ships as a complete assembly, ready to mate with a lower.

Frequently Asked Questions

Is this upper free-float? No, it uses the classic M4 Double Heat Shield handguard rather than a free-float rail; if you want a free-float M-LOK setup, Spikes also offers the BAR2 handguard version.

Does it include front and rear sights? It includes an A2 front sight base; a rear sight is not included, so you can add your preferred optic or rear iron sight.

Buy the Spikes Tactical ST-15 LE M4 Double Heat Shield Upper

Get a classic carbine profile with law enforcement-grade mil-spec quality. Order this AR-15 upper from our Lubbock, Texas gun shop for fast, insured shipping to your door.