BCA AR-15 Half Upper Assembly 10.5” 4150 Parkerized Heavy Barrel, .300 Blackout, Pistol Length Gas System, 1:8 Twist w/ 10” MLOK Rail

Out of stock


  • 10.5” Heavy Barrel 
  • 4150 Chrome Moly Vanadium 
  • Parkerized Finish
  • 1:8 Twist
  • 10.5” MLOK Rail 
  • .300 Blackout Caliber
  • Standard BCA BCG
  • Pistol Length Gas System
  • M4 Flat-Top Forged stripped Upper Receiver   
  • NO BCG

This BCA AR-15 Upper has a 10.5” barrel with a Heavy Barrel profile, made of 4150 Chrome Moly Vanadium steel with a Parkerized finish, and features a 1:8 Twist Rate, a Pistol length gas system and .750 Gas Block.
The Upper includes a 10” MLOK Rail, and a M4 flat-top forged stripped upper receiver. It is chambered in .300 Blackout and machined with 300 Blackout feed ramps in the barrel extension.

This BCA AR-15 Upper, like all BCA products, is subjected to numerous QA/QC checks which for our firearms and complete upper receiver assemblies includes test firing prior to approval and shipment. This Rifle is also backed by our Bear Den Guarantee.

Choose an upper designed by a US company and made in the USA. Choose Bear Creek Arsenal.

More Information
Color Black/ Charcoal Grey
SKU 634-UHA300PHB10.518P-10MLOK3
Length 10.5
Profile Heavy Barrel
Twist 1:8
Finish Parkerized
Material 4150 Chrome Moly Vanadium
Thread Pitch 5/8 x 24
Caliber .223 Wylde
Feed Ramp .300 Blackout
Flutes N/A
Gas System Pistol
Gas Block System 0.750
Gas Hole Diameter 0.1015
Dimpled Yes
Platform AR-15