Spike's Tactical M4 Forged Upper Receiver – Multi-Caliber Flat-Top AR-15

The Spike's Tactical M4 Forged Upper Receiver is a multi-caliber flat-top platform compatible with standard AR-15 lower receivers. Designed for 5.56 NATO/.223 Remington and other AR-15 pattern calibers, this stripped upper provides a mil-spec foundation for custom builds. The continuous Picatinny rail allows unlimited optic and sight configurations.

Machined from 7075-T6 forged aluminum with a hard coat anodized finish for durability and corrosion resistance. This is a stripped upper receiver with ejection port cover and forward assist installed—no barrel, handguard, or bolt carrier group included. Accepts standard AR-15 barrel nuts and handguards. Requires basic armorer tools and knowledge of AR-15 assembly for installation.

• Caliber: Multi-caliber (5.56 NATO, .223 Remington, and other AR-15 compatible calibers)
• Type: Forged stripped upper receiver
• Compatible Lower: AR-15 / M4 lower receivers
• Material: 7075-T6 forged aluminum
• Finish: Hard coat anodized
• Includes: Ejection port cover and forward assist installed
• Installation: Requires barrel, bolt carrier group, charging handle, and handguard (sold separately)