BCM M4 Upper Receiver Assembly (Laser T-Marks)

The BCM M4 Upper Receiver Assembly is a Mil‑Spec guided, semi-complete upper machined from 7075‑T6 aluminum forgings and finished with a Type III hard coat anodize. It ships assembled with a Mil‑Spec forward assist and ejection port cover and features laser T‑markings intended to assist optical remounting. The receiver accepts barrels using an M4 barrel extension and provides a Mil‑Std 1913 rail for optics and accessory mounting.

Key Specifications

• Made from 7075-T6 aluminum forgings for strength and durability.
• Finished with Hard Coat Anodized (Mil‑A‑8625F, Type III, Class 2) for corrosion resistance.
• Includes forward assist and ejection port cover in the assembled upper.
• Features a Mil‑Std 1913 rail for mounting optics and accessories.
• Machined for use with barrels that use a M4 barrel extension.
• Laser etching provides T‑markings to assist with optic remounting.
• Interior treated with dry film lubricant per Mil‑specs.
• Forward assist pawl is heat treated tool steel with a press‑fit and pinned cap.
• Product is Made in the U.S.A..
• Sights: None, optic ready.

Built to Mil‑Spec tolerances and finished for long‑term service, this assembled BCM upper provides a robust foundation for an AR‑15 build or upgrade. Its precision machining, laser T‑marks and Picatinny rail simplify optics alignment and accessory mounting for practical, real‑world use.