Sharps Bros Billet Upper Receiver Fits AR15 Black Finish Includes Forward Assist and Dust Cover SBUR04 UPC 850869008835
Product Description
The Sharps Bros. Billet AR-15 Upper Receiver in Anodized Black (MPN: SBUR04) is a premium, custom-machined upper receiver engineered to provide a seamless aesthetic match and lockup for Sharps Bros. lower receivers as well as standard Mil-Spec AR-15 lowers. Precision-machined from a solid block of high-strength 7075-T6 billet aluminum, the SBUR04 features clean, aggressive lines and subtle "SHARPS BROS." engravings on both sides of the receiver body.
Designed with a Mil-Spec front end interface, the SBUR04 is 100% compatible with all standard AR-15 barrel nuts and aftermarket handguards, including handguards featuring rear-facing anti-rotation indexing tabs. The ejection port is optimized for popular standard-caliber AR-15 builds, including .223 Remington, 5.56x45mm NATO, .224 Valkyrie, 300 AAC Blackout, 6.5 Grendel, and 6mm ARC configurations (Note: ejection port clearance is not dimensioned for big-bore calibers such as .450 Bushmaster, .458 SOCOM, or .50 Beowulf).
Finished in a durable Mil-Spec Type III hardcoat anodized black treatment for maximum corrosion and abrasion resistance, the SBUR04 comes complete with the forward assist assembly and steel ejection port dust cover pre-installed from the factory. Weighing just 9.0 ounces, the Sharps Bros. SBUR04 represents an exceptional foundation for custom, high-end rifle builds.
Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Direct fit for standard AR-15 lower receivers (optimized for Sharps Bros. billet lowers). Compatible w/ standard AR-15 barrel nuts, charging handles, bolt carrier groups (BCGs), and handguards with anti-rotation tabs. Caliber support includes 5.56 NATO, .223 Rem, 300 BLK, 6.5 Grendel, 6mm ARC, and .224 Valkyrie.
- Perform a complete firearm safety check: drop the magazine, lock the action open, and visually/physically inspect the chamber to verify zero live rounds are present.
- Apply grease (e.g., AeroShell 64 / 33MS) to the male receiver barrel extension threads.
- Insert your chosen AR-15 barrel extension into the front shank of the SBUR04 upper receiver, aligning the barrel pin with the top indexing notch.
- Thread your barrel nut onto the receiver threads and torque to manufacturer specification (typically 35–65 ft-lbs using a torque wrench).
- Slide a standard AR-15 charging handle and bolt carrier group into the rear receiver channel to check smooth, unhindered action travel.
- Mate the assembled upper to your lower receiver using standard front and rear takedown pins to verify snug fitment and zero upper-to-lower slop.
Key Features
- Precision 7075-T6 Billet Aluminum Construction: Machined from high-tensile aerospace billet alloy for superior rigidity and tight tolerances.
- Pre-Assembled Component Hardware: Ships w/ factory-installed forward assist assembly and ejection port dust cover door.
- Universal Handguard & Barrel Nut Compatibility: Mil-Spec front profile accepts all standard AR-15 handguards, including those with rear anti-rotation tabs.
- Type III Hardcoat Anodized Finish: MIL-SPEC matte black surface treatment offers ultimate scratch and chemical resistance.
- Optimized Multi-Caliber Shell Ejection: Fits 5.56 NATO, .223 Rem, 300 BLK, 6.5 Grendel, 6mm ARC, and .224 Valkyrie builds.
- Discrete Engraved Detailing: Clean styling w/ subtle "SHARPS BROS." branding roll-marked on receiver side walls.
Product Specifications
- Brand: Sharps Bros.
- Model/Series: Billet Upper Receiver (AR-15)
- MPN / SKU: SBUR04
- UPC: 850869008835
- Platform Compatibility: AR-15 Standard Lowers (Optimized for Sharps Bros. Billet Lowers)
- Caliber Compatibility: 5.56x45mm NATO, .223 Rem, 300 BLK, 6.5 Grendel, 6mm ARC
- Material: 7075-T6 Billet Aluminum
- Finish / Color: Mil-Spec Type III Hardcoat Anodized Black
- Included Hardware: Forward Assist Kit & Dust Cover Door (Pre-Installed)
- Weight: 9.0 oz
- Country of Origin: USA
