Centurion Arms CM4 Forged 5.56 Thermal Fit Receiver Set - RAL 8000

Centurion Arms CM4 Forged 5.56 Thermal Fit Receiver Set - RAL 8000

Engineered as the ultimate foundation for high-performance rifle builds, the Centurion Arms CM4 Forged 5.56 Thermal Fit Receiver Set in RAL 8000 combines military-grade durability with precision thermal-fit lockup. Forged from high-strength 7075-T6 aircraft-grade aluminum, this matching upper and lower receiver set is purpose-built for duty, competition, and tactical setups where mechanical rigidity and unyielding reliability under stress are non-negotiable.

Featuring a undersized Thermal Fit upper receiver inner diameter (.997"), this set requires heat expansion during barrel installation to form an exceptionally tight, seamless bond with your M4 barrel extension, dramatically reducing flex and improving shot-to-shot consistency. Finished in a rugged RAL 8000 Cerakote over MIL-A-8625F Type III Class 2 hard-coat anodizing, the CM4 set provides extreme protection against wear and corrosion while bringing a distinctive, earthy tactical aesthetic to your custom AR-15 build.

Features

Thermal Fit Upper Receiver:
Undersized .997" inner diameter requires heat expansion during assembly to create an ultra-tight barrel extension lockup for maximum rigidity and shot-to-shot accuracy.

7075-T6 Forged Aluminum:
Forged from aircraft-grade aluminum to deliver exceptional structural integrity and lightweight durability for long-term operational use.

RAL 8000 Cerakote Finish:
Applied over Type III Class 2 hard-coat anodizing to supply superior defense against scratches, corrosion, and environmental wear with a modern tactical colorway.

Factory Upper Assembly Included:
Upper receiver arrives pre-assembled with a installed ejection port cover and forward assist to streamline your custom assembly process.

M4 Barrel Extension Compatibility:
Engineered for seamless integration with M4-style feed ramps and barrel extensions to ensure smooth, continuous ammunition feeding.

MIL-Spec Lower Component Acceptance:
Lower receiver is fully compatible with standard MIL-Spec AR-15 lower parts kits, triggers, safety selectors, and extension tubes.

Specifications