Spikes Tactical SPIKE’S 556NATO M4 LE Upper – 16″

The Spikes Tactical SPIKE'S 556NATO M4 LE complete upper is built to Mil-Spec standards and configured for M4 carbine-length systems. Components include a 16" 1:7 twist chrome-moly barrel with a carbine-length gas system, a 9" BAR2 free-float rail, and a flat-top receiver that is optic-ready. The assembly is finished in black phosphate and ships as a complete, drop-in upper.

Key Specifications

• The caliber is .223 REM / 5.56 NATO.
• The barrel measures 16 inches.
• The barrel finish is Black Phosphate.
• The barrel material is Chrome Moly.
• The rate of twist is 1:7.
• The gas system is Carbine length.
• The gas seat diameter is .750 inches.
• The handguard is a 9" BAR2 free-float rail system.
• The receiver is 7075-T6 aluminum, black.
• The bolt carrier group is a Spike's Tactical Mil-Spec M16 BCG.

Designed for reliability and established Mil-Spec compatibility, this upper is suited for owners building or upgrading M4-style AR platforms who want a complete, ready-to-install assembly with a free-float rail for accessory mounting and an optic-ready flat top. Its combination of a 1:7 twist 16" chrome-moly barrel and a robust BAR2 handguard delivers a practical balance of accuracy and modularity for range use, training, and general-purpose rifle configurations.