Spikes Tactical Ar-15/M16 M4 Upper Receiver

The Spike's Tactical AR-15/M16 M4 upper receiver is a complete, fully assembled upper ready to drop onto your existing AR lower and get to the range or field. Built to military specifications with every component manufactured, finished, and tested for reliability, this upper delivers the kind of solid performance you expect from Spike's reputation for no-nonsense, American-made parts. Whether you're building a patrol rifle, home-defense carbine, or upgrading an existing platform, this is a straightforward, proven upper that works.

The 16-inch M4-profile barrel is chambered in 5.56 NATO and built tough: hard-chromed chamber and bore resist corrosion even in harsh conditions, while high-pressure testing and magnetic particle inspection verify barrel strength before it ships. Extended M4 feed ramps keep ammunition feeding reliably during rapid fire, and the design includes a cutout compatible with grenade, tear gas, or bean bag launchers if your mission calls for it. You get a standard M4 plastic handguard, A2 flash suppressor, bayonet lug, and front sling swivel right out of the box.

Spike's doesn't do cosmetic shortcuts: the receiver top and bolt carrier feature their spider logo via laser etch that won't fade or wear off, and T-markings are laser-etched directly into the rail slots for the same longevity. This is the kind of attention to detail that makes for a rifle you can trust when it matters.

Key Features

• Completely assembled upper receiver ready to install on AR-15/M16/M4 lower
• 16-inch M4-profile barrel in 5.56 NATO
• Hard-chromed chamber and bore for corrosion resistance
• High-pressure tested and magnetic particle inspected barrel for proven durability
• Extended M4 feed ramps for reliable feeding during rapid fire
• Includes M4 plastic handguard, A2 flash suppressor, bayonet lug, and front sling swivel
• Laser-etched markings and logo that resist fading and wear
• Grenade/tear gas/bean bag launcher cutout

Specifications

Frequently Asked Questions

What AR lower receivers is this upper compatible with?

This upper is designed to install on AR-15/M16/M4 lower receivers. Compatibility is standard across these platforms, but as always, verify your specific lower before purchasing.

What ammunition does the barrel accept?

The 16-inch barrel is chambered for 5.56 NATO ammunition.

What components come included with the upper?

The upper arrives fully assembled and includes a standard M4 plastic handguard, A2 flash suppressor, bayonet lug, and front sling swivel. It is ready to attach to a lower receiver and function.

Is this barrel tested for strength and durability?

Yes. Every barrel is high-pressure tested and undergoes magnetic particle inspection to verify it meets military specifications and confirm strength before shipment.