This Bear Creek Arsenal complete AR-15 upper delivers rifle length gas system performance through a 20 inch barrel in 4150 Chrome Moly Vanadium with black nitride finish and 1:8 twist rate. The upper assembly includes E9310 bolt carrier group, charging handle, and detachable Picatinny carry handle with built in sight. Built around a drop in polymer handguard for lightweight accessory mounting, this upper provides a fully assembled solution for AR-15 lower receivers chambered in 5.56 NATO requiring rifle gas system function and 20 inch barrel performance.
The 20 inch barrel is manufactured from 4150 Chrome Moly Vanadium steel with black nitride finish for corrosion resistance and surface hardness. The 1:8 twist rate stabilizes common 5.56 NATO bullet weights from 55 grain through 77 grain, supporting accuracy across a wide range of ammunition types. Rifle length gas system provides smooth cycling characteristics with reduced felt recoil compared to shorter gas systems, making this configuration well suited for precision shooting and extended range applications. Black nitride finish penetrates the steel surface for long term protection that resists wear during extended firing schedules.
The included bolt carrier group is manufactured from E9310 steel, a common material for AR-15 bolt carriers that provides adequate strength for 5.56 NATO pressures. The complete bolt carrier group includes bolt, carrier, gas key, cam pin, and firing pin, eliminating the need to source these components separately. This ready to install configuration saves assembly time and ensures proper component compatibility.
The detachable Picatinny carry handle features a built in rear sight for traditional iron sight configuration. The carry handle mounts to the upper receiver Picatinny rail, allowing removal for optics mounting while maintaining the option to reinstall for backup iron sights or traditional shooting. The built in sight provides windage and elevation adjustment for zeroing at various distances. This configuration combines the benefits of traditional carry handle sights with the flexibility of modern Picatinny rail systems.
The drop in polymer handguard provides a lightweight platform that reduces overall upper weight while maintaining structural support for accessories. Polymer construction resists heat buildup during extended firing compared to metal handguards. The drop in design simplifies installation and removal without requiring specialized tools or barrel nut modifications. Standard handguard cap interface ensures compatibility with common accessories and front sights.
BCG and charging handle are included. Follow safe handling and manufacturer instructions. Ensure compatibility with your specific AR-15 lower receiver before installation. Verify headspace and function after installation. Ensure compliance with all applicable laws.
Caliber: 5.56 NATO
Barrel Length: 20 inches
Barrel Finish: Black Nitride
Barrel Material: 4150 Chrome Moly Vanadium
Barrel Twist Rate: 1:8
Gas System: Rifle-Gas
Handguard Material: Polymer
Handguard Style: Drop-In
Bolt Carrier Group: E9310
Carry Handle: Detachable Picatinny Carry Handle with Built-in Sight
Assembled: Yes
Includes: Bolt Carrier Group, Charging Handle, assembled AR-15 Upper
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