Fortis Manufacturing Billet M4 Upper Receiver for AR-15 5.56 NATO/.223 Rem – Stripped, Anodized Black (U-Billet-M4)

• Stripped upper receiver designed for AR-15 platform chambered in 223 Remington 556 NATO
• Machined from aircraft grade 7075 T6 aluminum for strength and durability
• Includes M4 feed ramp for reliable cartridge feeding during operation
• Integrated 1913 Picatinny flat top rail for mounting optics and accessories
• Lightweight design approximately 6.7 ounces reducing overall rifle weight
• Black anodized finish with engraved logos providing surface protection

The Fortis Manufacturing, Inc. Billet M4 Upper Receiver is an upper receiver designed for housing and aligning components in AR-15 rifle builds.

The Fortis Manufacturing, Inc. Billet M4 Upper Receiver is machined from 7075-T6 aluminum and features a Type III hard coat anodized black finish. This upper receiver fits AR-15 platforms and supports .223 Remington and 5.56 NATO calibers. It includes an M4 feed ramp and a 1913 Picatinny rail flat top for mounting optics or accessories. The unit weighs approximately 6.7 ounces and includes engraved logos on multiple surfaces. In typical setups, the Fortis Manufacturing, Inc. Billet M4 Upper Receiver integrates with compatible lower receivers to form a complete rifle assembly. This product is used for AR-15 builds requiring a stripped upper receiver with billet construction and standard mounting interface.