Bear Creek Arsenal AR-15 4.5" .300 Blackout Upper Receiver W/Micro Flash Hider

Bear Creek Arsenal BC-15 .300 Blackout 4.5" Micro Forged Complete Upper Assembly

Engineered for ultra-compact performance, the Bear Creek Arsenal BC-15 .300 Blackout Upper Assembly features an ultra-short 4.5" heavy barrel paired with a micro-length gas system and a micro flash hider. Designed around the versatile .300 AAC Blackout cartridge, this complete upper delivers full bullet stabilization in an extremely maneuverable footprint, making it the ultimate setup for AR-15 pistol builds and personal defense weapon (PDW) configurations.

Key Features & Advantages

• Ultra-Compact 4.5" Heavy Profile Barrel: Precision-machined from 4150 Chrome Moly Vanadium steel with a durable Parkerized finish to maximize durability under rapid fire.
• Optimal 1:8 Twist Rate: Engineered to reliably stabilize both supersonic (110–125 grain) and heavy subsonic (190–220 grain) .300 Blackout factory loads.
• Micro-Length Gas System: Tuned micro gas operation ensures reliable cycling and extraction in short-barrel pistol platforms.
• 4" M-LOK Split Rail Handguard: Compact, lightweight skeletonized handguard provides solid mounting slots for weapon lights, hand stops, and accessories.
• Complete Drop-In Assembly: Standard rear charging style; ships complete with a full bolt carrier group (E9310 steel bolt), charging handle, and micro flash hider—ready to attach to any mil-spec AR-15 lower receiver.

Technical Specifications