Gun Upper – SAE 4340 Alloy Steel

High-Strength Alloy Steel Precision Machining |
Suitable for Military-Grade Weapon Mock-Up and Testing Platforms

FuJia Metal manufactures high-strength firearm upper receivers using SAE 4340 alloy steel, engineered for exceptional toughness, impact resistance, and heat treatment stability. Ideal for military-grade weapon simulation and training platforms, these components are produced through 5-axis CNC machining combined with multi-stage heat treatment and precision finishing, ensuring:

• Consistent hardness and dimensional accuracy

• Full traceability with serialized markings

• Premium surface quality for durability and corrosion resistance

Each upper receiver is designed to withstand the high load-bearing stresses of simulation systems. Post heat-treatment, all parts undergo ultrasonic flaw detection and full dimensional inspection, guaranteeing compliance with strict military specifications.

We also offer custom-fit mechanical structures for different mock-up platforms, including Picatinny rails, MIM components, and precision mounts, ensuring stable, repeatable performance during intensive training and testing.