• Caliber: 5.56 NATO
  • Finish: Type III Class 2 Hardcoat Anodized Finish
  • Upper Receiver: Spike's Tactical Forged M4 Flat Top Upper - 7075-T6 Aluminum
  • Handguard: 13.5-Inch Spike's Tactical CRR M-LOK Rail - 6061-T6 Aluminum
  • M4 Feed Ramps: Yes
  • Muzzle Device: Mil-Spec A2 Flash Hider
  • Barrel: 16” 1:7 Twist 5.56 NATO Chrome Lined CMV Barrel
  • Muzzle Thread Pattern: 1/2"-28
  • Gas Block: Spike's Tactical .750" Low Profile Gas Block
  • Gas Tube: Mid-Length Melonited Gas Tube
  • Bolt Carrier Group: Spike's Tactical Mil-Spec M16 Bolt Carrier Group
  • Charging Handle: Mil-Spec Charging Handle
  • High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI)


  • Weight: ~3 lbs. 15 oz.
  • Length: ~24.45"


  • AR-15 lower receiver


  • 1x Spike's Tactical 16" Mid-Length 5.56 Upper w/ CRR M-LOK Rail
  • 1x Spike's Tactical Mil-Spec M16 Bolt Carrier Group
  • 1x Mil-Spec Charging Handle
  • 3x M-LOK Rail Covers
  • 1x QD Swivel


When building an AR-15, instead of buying all the upper assembly parts separately, you can go for a complete upper assembly that comes pre-assembled. The Spike's Tactical complete upper assembly is an excellent option.

It comes with a standard 16-inch Chrome Lined CMV barrel with a 1:7 Twist rifling, ideal for most 5.56 NATO bullet weight. The barrel is threaded with a 1/2"-28 thread pitch and comes with a Mil-Spec A2 flash hider.

CRR M-LOK Handguard

The upper uses a low-profile gas system with a mid-length melonited Gas tube. The barrel and gas system are covered by a slim-profile handguard. The 13.5-Inch Spike's Tactical CRR M-LOK Rail to be exact. This rail has M-LOK slots on the bottom and both sides, whereas, on the top, it has a continuous Picatinny rail. The Spike's Tactical CRR M-LOK Rail is made from 6061-T6 aluminum.

Mil-Spec Receiver and Components

The receiver is made from 7075-T6 aluminum and has a hard-coat anodized finish. It comes with a Spike's Tactical Mil-Spec M16-Profile Bolt Carrier Group and a standard Mil-Spec charging handle. The receiver also comes with a port door and a forward assist, like all Mil-Spec M4 rifles.

Have a question?

Ask an Expert