Complete Upper Assemblies

Bear Creek Arsenal Complete Upper Assemblies consist of a Barrel, Flash Hider, Hand Rail, Barrel Nut, Gas Block, Gas Tube, Complete BCG (Bolt Carrier Group), and a Charging Handle.

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  1. BCA URSID HYBRID BEAR AR-15 Complete Upper Assembly, 16" 416R Stainless M4 Contour Barrel, .223 Wylde, Carbine Length Gas System, 1:8 Twist w/ 15" Lightweight Keymod
    BCA URSID HYBRID BEAR AR-15 Complete Upper Assembly, 16" 416R Stainless M4 Contour Barrel, .223 Wylde, Carbine Length Gas System, 1:8 Twist w/ 15" Lightweight Keymod
    Sku: 603-UA223WCM41618SS-15LWKM2
    Special Price $209.90 was $354.99

    SKU: UA223WCM41618(SS)-(15)LWKM2

    • 16" 416R Stainless Steel Barrel w/ 1:8 Twist
    • Contour Barrel Profile
    • 15" Keymod Rail
    • .223 WYLDE Caliber
    • M4 Flat Top Upper Receiver
    • Carbine Length Gas System, .750 Diameter Gas Block
    • BCA Standard BCG
    • Charging Handle
    • Bird Cage Flash Hider
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  2. BCA URSID HYBRID BEAR AR-15 Complete Upper Assembly, 16" 4150 Parkerized M4 Contour Barrel, .223 Wylde, 1:8 Twist w/ 15" Lightweight Keymod
    BCA URSID HYBRID BEAR AR-15 Complete Upper Assembly, 16" 4150 Parkerized M4 Contour Barrel, .223 Wylde, 1:8 Twist w/ 15" Lightweight Keymod
    Sku: UA223WCM41618(P)-(15)LWKM
    Special Price $209.90 was $349.99

    SKU: UA223WCM41618(P)-(15)LWKM

    • 16" M4 Contour Barrel
    • 4150 Chrome Moly Vanadium Steel
    • 1:8 Twist
    • Parkerized Finish
    • 15" Keymod Rail
    • .223 WYLDE Caliber
    • M4 Flat Top Upper Receiver
    • Carbine Length Gas System, .750 Diameter Gas Block
    • BCA Standard BCG
    • Charging Handle
    • Bird Cage Flash Hider
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  3. BCA AR-15 Complete Upper Assembly 5.56 NATO, 16" 4150 Black Nitride Heavy Barrel, 1:7 Twist w/ 15" Lightweight Keymod
    BCA AR-15 Complete Upper Assembly 5.56 NATO, 16" 4150 Black Nitride Heavy Barrel, 1:7 Twist w/ 15" Lightweight Keymod
    Sku: UA556MM41617(M)-(15)LWKM
    Special Price $218.40 was $395.99

    SKU: UA556MM41617(M)-(15)LWKM

    • 16" 4150 Black Nitride Barrel w/ 1:7 Twist
    • Heavy Barrel Profile
    • LWKM
    • 5.56 NATO Caliber
    • M4 Flat Top Upper Receiver
    • Mid Length Gas System,
    • BCA Standard BCG
    • Charging Handle
    • Bird Cage Flash Hider
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  4. BCA Grizzly Bear III .224 Valkyrie Complete Upper Assembly, 18" Mid Weight Stainless Steel Barrel, Fluted, 1:7 w/ M-LOK Rail
    BCA Grizzly Bear III .224 Valkyrie Complete Upper Assembly, 18" Mid Weight Stainless Steel Barrel, Fluted, 1:7 w/ M-LOK Rail
    Sku: 681-UA224VMMW1817SSSF-15MLOK
    Special Price $218.49 was $410.99

    SKU: UA224VMMW1817(SSSF)-(15)MLOK

    • 18" Heavy Barrel
    • 416R Stainless steel
    • Stainless Steel Finish
    • Spiral Flutes
    • 1:7 Twist
    • .224 Valkyrie Caliber
    • Mid Length Gas System
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  5. BCA AR-15 Complete Upper, 16” 4150 Parkerized Heavy Barrel, .300 Blackout, Carbine Length Gas System, 1:8 Twist w/ 15” LWKM Rail
    BCA AR-15 Complete Upper, 16” 4150 Parkerized Heavy Barrel, .300 Blackout, Carbine Length Gas System, 1:8 Twist w/ 15” LWKM Rail
    Sku: 640-UA300CHB1618P-15LWKM
    Special Price $219.90 was $349.99
    • 16” Heavy Barrel 
    • 4150 Chrome Moly Vanadium
    • Parkerized Finish
    • 1:8 Twist
    • 15” LWKM Rail
    • .300 Blackout
    • Carbine Length Gas System
    • M4 Flat-Top Forged Upper Receiver
    • Standard Bear Creek Arsenal Bolt Carrier Group
    • Charging Handle
    • LS2 Flash Hider
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  6. BCA AR-15 Complete Upper, 20” 4150 Black Nitride Finish Heavy Barrel, 5.56 NATO, Rifle Length Gas System, 1:7 Twist w/ Standard Hand Guard
    BCA AR-15 Complete Upper, 20” 4150 Black Nitride Finish Heavy Barrel, 5.56 NATO, Rifle Length Gas System, 1:7 Twist w/ Standard Hand Guard
    Sku: 632-UA556RHB2017M-RHG
    Special Price $219.90 was $239.00
    • 20” Heavy Barrel
    • 4150 Chrome Moly Vanadium
    • Black Nitride / Melonite Finish
    • 1:7 Twist
    • Standard Hand Guard
    • 5.56 NATO
    • Rifle Length Gas System
    • M4 Flat-Top Forged Upper Receiver
    • Standard Bear Creek Arsenal Bolt Carrier Group
    • Charging Handle
    • Birdcage Flash Hider
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  7. UA224VRHB2017-SS-15-MLOK2LS-WEBMAIN
    BCA AR-15 COMPLETE UPPER ASSEMBLY, 20" 416R STAINLESS STEEL, HEAVY BARREL, .224 VALKYRIE, RIFLE LENGTH GAS SYSTEM, 1:7 TWIST W/ 15" MLOK
    Sku: 679-UA224VRHB2017SS-15MLOK2LS
    Special Price $219.90 was $376.99

    SKU: UA224VRHB2017(SS)-(15)MLOK2LS

    • 20" Heavy Barrel
    • 416R Stainless steel
    • Parkerized Finish
    • 1:7 Twist
    • .224 Valkyrie Caliber
    • Rifle Length Gas System
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  8. BCA Grizzly Bear III .224 Valkyrie Complete AR-15 Upper Assembly, 18" Mid Weight Barrel, 1:7 w/ M-LOK Rail
    BCA Grizzly Bear III .224 Valkyrie Complete AR-15 Upper Assembly, 18" Mid Weight Barrel, 1:7 w/ M-LOK Rail
    Sku: 677-UA224VMMW1817SS-15MLOK2LS
    Special Price $219.90 was $371.99

    SKU: UA224VMMW1817(SS)-(15)MLOK2LS

    • 18" Heavy Barrel
    • 416R Stainless steel
    • Stainless Steel Finish
    • 1:7 Twist
    • .224 Valkyrie Caliber
    • Rifle Length Gas System
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  9. BCA AR-15 Complete Upper Assembly, 16" 4150 Parkerized Heavy Barrel, .300 Blackout, Pistol Length Gas System, 1:8 Twist w/ 15 MLOK
    BCA AR-15 Complete Upper Assembly, 16" 4150 Parkerized Heavy Barrel, .300 Blackout, Pistol Length Gas System, 1:8 Twist w/ 15 MLOK
    Sku: 637-UA300PHB1618P-15MLOK
    Special Price $219.90 was $349.99

    SKU: UA300PHB1618(P)-(15)MLOK

    • 16" Heavy Barrel
    • 4150 Chrome Moly Vanadium
    • Parkerized Finish
    • 1:8 Twist
    • 15" MLOK Rail
    • .300 Blackout Caliber
    • Pistol Length Gas System
    • M4 Flat Top Forged Upper Receiver
    • BCA Standard BCG
    • Charging Handle
    • Bird Cage Flash Hider
    Learn More
  10. BCA AR-15 COMPLETE UPPER ASSEMBLY, 16" PARKERIZED 4150 STEEL HEAVY BARREL, DIAMOND FLUTED, .223 WYLDE, CARBINE LENGTH GAS SYSTEM, 1:8 TWIST W/ 12" MLOK RAIL
    BCA AR-15 Complete Upper Assembly, 16" Parkerized 4150 Steel Heavy Barrel, Diamond Fluted, .223 Wylde, Carbine Length Gas System, 1:8 Twist w/ 12" MLOK Rail
    Sku: UA223WCHB1618(PFC)-(12)MLOK
    Special Price $219.90 was $384.99

    SKU: UA223WCHB1618(PFC)-(12)MLOK

    • 16" Parkerized 4150 Chrome Moly Vanadium Barrel
    • Heavy Barrel Profile
    • 1:8 Twist
    • Diamond Fluted
    • .223 WYLDE Caliber
    • Carbine Length Gas System
    • 12" MLOK Rail
    • BCA Standard BCG
    • Charging Handle
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