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.  UA556CM410.517(P)-(10)MLOK-WEBMAIN.
    BCA AR-15 Complete Upper Assembly, 10.5" Parkerized 4150 Contour Barrel, 5.56 NATO, 1:7 Twist w/ 10" M-LOK Rail
    Sku: 627-UA556CM410.517P-10MLOK
    Special Price $189.90 was $342.99

    SKU: UA556CM410.517(P)-(10)MLOK

    • 10.5" 4150 Parkerized Barrel w/ 1:7 Twist
    • Contour Barrel Profile
    • MLOK
    • 5.56 NATO Caliber
    • M4 Flat Top Upper Receiver
    • Carbine Length Gas System,
    • BCA Standard BCG
    • Charging Handle
    • Bird Cage Flash Hider
    Learn More
  2. BCA AR-15 Complete Pistol Upper Assembly, 10.5" 4150 Parkerized M4 Contour Barrel, 5.56 NATO, Carbine Length Gas System, 1:7 Twist w/ 10" Lightweight Keymod Rail
    BCA AR-15 Complete Pistol Upper Assembly, 10.5" 4150 Parkerized M4 Contour Barrel, 5.56 NATO, Carbine Length Gas System, 1:7 Twist w/ 10" Lightweight Keymod Rail
    Sku: UA556CM410.517(P)-(10)LWKM
    Special Price $189.90 was $342.99

    SKU: UA556CM410.517(P)-(10)LWKM

    • 10.5" Parkerized 4150 Chrome Moly Vanadium Barrel w/ 1:7 Twist
    • M4 Contour Barrel Profile
    • 10" Keymod Rail
    • 5.56 NATO Caliber
    • Forged Upper Receiver
    • Carbine Length Gas System, .750 Diameter Gas Block
    • BCA Standard BCG
    • Charging Handle
    • Bird Cage Flash Hider
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  3. thumb
    BCA AR-15 Complete Upper Assembly 7.62x39, 16" 4150 Parkerized Barrel, 1:10 Twist w/ 10" Free Floating Quad Rail
    Sku: UA762CHB16110(P)-(10)FFQ
    Special Price $189.91 was $344.99

    SKU: UA762CHB16110(P)-(10)FFQ

    • 16" 4150 Parkerized Barrel w/ 1:10 Twist
    • Heavy Barrel Profile
    • Free Floating Quad Rail
    • 7.62x39 Caliber
    • M4 Flat Top Upper Receiver
    • Carbine Length Gas System
    • BCA Standard BCG
    • Charging Handle
    • Bird Cage Flash Hider
    Learn More
  4. BCA AR-15 Complete Upper Assembly, 5.56 NATO, 16" 4150 Black Nitride barrel, 1:7 Twist, Standard Hand Guard w/ Gas Block
    BCA AR-15 Complete Upper Assembly, 16" Black Nitride 4150 Steel Contour Barrel, 5.56 NATO, 1:7 Twist, w/ Standard Hand Guard, Gas Block
    Sku: UA556CM41617(M)-SHG(GB)
    Special Price $189.91 was $329.99

    SKU: UA556CM41617(M)-SHG(GB)

    • 16" Black nitride 4150 Chrome Moly Vanadium Barrel w/ 1:7 Twist
    • Contour
    • Standard Hand Guard
    • 5.56 NATO Caliber
    • M4 Flat Top Upper Receiver
    • Carbine Length Gas System, .750 Diameter Low Profile Gas Block
    • BCA Standard BCG with proprietary BCA AKM Bolt
    • Charging Handle
    • Bird Cage Flash Hider
    Learn More
  5. BCA 16" 5.56 NATO Parkerized 1:7, Gas Block AR-15 Complete Upper Assembly
    BCA AR-15 Complete Upper Assembly, 16" Parkerized 4150 Steel Contour Barrel, 5.56 NATO, 1:7 Twist, w/ Standard Hand Guard, Gas Block
    Sku: UA556CM41617(P)-SHG(GB)
    Special Price $189.91 was $319.99

    SKU: UA556CM41617(P)-SHG(GB)

    • 16" Parkerized 4150 Chrome Moly Vanadium Barrel w/ 1:7 Twist
    • Contour
    • Standard Hand Guard
    • 5.56 NATO Caliber
    • M4 Flat Top Upper Receiver
    • Carbine Length Gas System, .750 Diameter Low Profile Gas Block
    • BCA Standard BCG with proprietary BCA AKM Bolt
    • Charging Handle
    • Bird Cage Flash Hider
    Learn More
  6. UA223WCHB1618(MFC)-(12)-WEBMAIN
    BCA AR-15 Complete Upper Assembly, 16" Black Nitride Heavy Barrel, Diamond Fluted, .223 Wylde, Carbine Length Gas System, 1:8 Twist w/ 12" MLOK Rail
    Sku: 615-UA223WCHB1618MFC-12MLOK
    Special Price $199.41 was $394.99

    SKU: UA223WCHB1618(MCF)-(12)MLOK

    • 16" Black Nitride Finish
    • Heavy Barrel Profile
    • 1:8 Twist
    • Diamond Flutes
    • 12" MLOK Rail
    • .223 Wylde Caliber
    • Carbine Length Gas System
    • BCA Standard BCG
    • Charging Handle
    Learn More
  7. BCA 47 Standard AR-15 Complete Upper Assembly 7.62x39, 16" 4150 Black Nitride barrel, 1:10 Twist, Standard Hand Guard w/ Front Sight
    BCA 47 Standard AR-15 Complete Upper Assembly 7.62x39, 16" 4150 Black Nitride barrel, 1:10 Twist, Standard Hand Guard w/ Front Sight
    Sku: UA762CHB16110(M)-SHG(FS)
    Special Price $199.41 was $329.99

    SKU: UA762CHB16110(M)-SHG(FS)

    • 16" Black Nitride 4150 Chrome Moly Vanadium Barrel w/ 1:10 Twist
    • Heavy Barrel Profile
    • Standard Hand Guard
    • 7.62x39 Caliber
    • M4 Flat Top Upper Receiver
    • Carbine Length Gas System, .750 Diameter Low Profile Gas Block
    • BCA Standard BCG with Standard BCA Bolt
    • Charging Handle
    • Bird Cage Flash Hider
    Learn More
  8. BCA AR-15 Complete Upper Assembly, 16" Parkerized 4150 Steel SOCOM Barrel, .223 Wylde,  1:8 Twist w/ 12" M-LOK Rail
    BCA AR-15 Complete Upper Assembly, 16" Parkerized 4150 Steel SOCOM Barrel, .223 Wylde, 1:8 Twist w/ 12" M-LOK Rail
    Sku: UA223WMMW1618(P)-(12)MLOK
    Special Price $199.90 was $322.99

    SKU: UA223WMMW1618(P)-(12)MLOK

    • 16" 416R Stainless Steel Barrel w/ 1:8 Twist
    • Mid Weight Barrel Profile
    • 12" MLOK
    • .223 Wylde Caliber
    • M4 Flat Top Upper Receiver
    • Mid Length Gas System,
    • BCA Standard BCG
    • Charging Handle
    • Bird Cage Flash Hider
    Learn More
  9. BCA AR-15 Complete Upper Assembly, 18" 4150 Parkerized Heavy Barrel, .223 Wylde, Mid Length Gas System, 1:7 Twist w/ 12" MLOK
    BCA AR-15 Complete Upper Assembly, 18" 4150 Parkerized Heavy Barrel, .223 Wylde, Mid Length Gas System, 1:7 Twist w/ 12" MLOK
    Sku: UA223WMHB1817(P)-(12)MLOK
    Special Price $199.90 was $399.99

    SKU: UA223WMHB1817(P)-(12)MLOK

    • 18" Heavy Barrel
    • 4150 Chrome Moly Vanadium Steel
    • Parkerized Finish
    • 1:7 Twist
    • 12" MLOK Rail
    • .223 Wylde Caliber
    • Mid Length Gas System
    • M4 Flat Top Forged Upper Receiver
    • BCA Standard BCG
    • Charging Handle
    • Bird Cage Flash Hider
    Learn More
  10. webmain
    BCA AR-15 Complete Upper Assembly, 16" Parkerized 4150 Heavy Barrel, .300 Blackout, 1:8 Twist, w/ 12" M-LOK Rail, .750 Gas Block Diameter
    Sku: UA300CHB1618(P).750-(12)MLOK
    Special Price $199.90 was $344.99

    SKU: UA300CHB1618(P).750-(12)MLOK

    • 16" 4150 Parkerized Barrel w/ 1:8 Twist
    • Heavy Barrel Profile
    • MLOK
    • .300 Blackout Caliber
    • M4 Flat Top Upper Receiver
    • Carbine Length Gas System,
    • BCA Standard BCG
    • Charging Handle
    • Bird Cage Flash Hider
    Learn More
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115 items

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