Product Details

This BCA (Bear Creek Arsenal) AR-15 Complete Upper has a 10.5” barrel with a M4 Contour profile, made of 4150 steel with a Parkerized finish, and features a 1:8 Twist Rate, a Carbine length gas system and .750 Gas Block. The Upper includes a 10” Lightweight Keymod Rail, an M4 flat-top forged upper receiver with forward assist, a BCA Bolt Carrier Group, an LS2 Flash Hider, and a Charging Handle. It is chambered in 5.56 NATO and machined with M4 feed ramps in the barrel extension.

  • 10.5” M4 Contour Barrel
  • 4150 Chrome Moly Vanadium
  • Parkerized Finish
  • 1:8 Twist
  • 10” Lightweight Keymod Rail
  • 5.56 NATO
  • Carbine Length Gas System
  • M4 Flat-Top Forged Upper Receiver
  • Standard Bear Creek Arsenal Bolt Carrier Group
  • Charging Handle
  • LS2 Flash Hider
This BCA AR-15 Complete Upper, like all BCA products, is subjected to numerous QA/QC checks which for BCA's firearms and complete upper receiver assemblies includes test firing prior to approval and shipment. This Rifle is also backed by BCA's Bear Den Guarantee.


It is the customer's responsibility to be aware of all applicable laws and regulations regarding the purchase and ownership of uppers with a barrel length of less than 16". Federal NFA regulations are applicable to this item. An “AR-15 Pistol” upper assembly has a barrel less than 16” in length. Pistol uppers are only for use on AR-15 pistol lowers and legal Short-Barreled Rifles. Other configurations may violate Federal law.

More Information

More Information
Category Gun Parts
Caliber 223/5.56
Manufacturer SKU 622-UA556CM410.518P-10LWKM3
UPC 11122233729
Condition New
Manufacturer Bear Creek Arsenal
Barrel Length 10.5"
Twist 1:8
Color Black

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