Complete uppers are helpful for those that are looking to swap to a new caliber on their AR-15 or AR-10 quickly. Own a 5.56NATO AR-15? Buy a .300 Blackout complete upper below and attach to your existing lower. Same with AR-10. Already have a .308 Win AR? Buy a 6.5 Creedmoor upper below and start blasting.

A complete upper is exactly as it sounds. Complete. That means it comes with the upper, barrel, muzzle device, handguard, and most times bolt carrier group.  There are many different calibers that allow for quick swap onto your existing AR-15/AR-10 lower. Check out all of our complete uppers below and start your next build or upgrade your existing AR.

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    BCA-15 .300 Blackout 16″ Stainless Black Nitride Fluted Heavy Barrel Complete Upper w/BCG Side Charger
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    This BCA AR-15 complete 300 Blackout rifle length upper has a 16″ bear claw fluted heavy barrel with a 416R stainless steel with black nitride finish, and features a 1:8…

    $399.99
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    BCA AR-10 Complete Upper w/BCG .243 Winchester Forged 20in. Heavy Barrel 15in. MLOK
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    BCA AR-10 Complete Upper w/BCG .243 Winchester Forged 20in. Heavy Barrel 15in. MLOK

    $379.99
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    BCA-15 7.62×39 AR-15 Pistol Complete Upper 7.5″ Barrel, 7″ MLOK Side Charger w/BCG
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    This BCA AR-15 complete 7.62×39 pistol length upper has a 7.5″ heavy barrel with a parkerized finish, and features a 1:10 twist rate, with a pistol length gas system. It…

    $329.99
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    Complete AR-15 Upper Receiver w/BCG .350 Legend, 20″ Parkerized Heavy Barrel, 1:16 Twist, Carbine Length Gas System, 15″ MLOK Rail|Side Charging Upper (Gen 2)|New MLOK
    0 out of 5

    This BCA AR-15 complete 350 Legend rifle length upper has a 20″ heavy barrel with a parkerized finish, and features a 1:16 twist rate, with a carbine length gas system….

    $399.99
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  • BC-15 | 6.5 Grendel Right Side Charging Upper | 10.5” Black Nitride Heavy Barrel | 1:8 Twist | Pistol Length Gas System | 10” MLOK | with BCG & Charging Handle
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    BCA AR-15 6.5 Grendel 10.5in Barrel Pistol Complete Upper Side Charger w/BCG
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    BCA AR-15 6.5 Grendel 10.5in Barrel Pistol Complete Upper Side Charger w/BCG

    $299.99
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  • BC-10 | 22-250 Forged Upper | 24" Black Nitride Light-weight Barrel | 1:14 Twist | Rifle Length Gas System | 15" MLOK Split Rail | with BCG & Charging Handle
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    BCA AR-10 .22-250 Complete Upper 24in MLOK 1:14 Twist w/BCG
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    BCA AR-10 .22-250 Complete Upper 24in MLOK 1:14 Twist w/BCG

    $399.99
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    BCA AR-15 .300 Blackout Complete Upper w/BCG 16in SS Black Nitride 1:8 Twist
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    BCA AR-15 .300 Blackout Complete Upper w/BCG 16in SS Black Nitride 1:8 Twist

    $339.99
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  • BC-10 | 6.5 Creedmoor Forged Upper | 20” Black Nitride Heavy Barrel | 1:8 Twist | Rifle Length Gas System | 15” MLOK Split Rail | with BCG & Charging Handle
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    BCA AR-10 6.5 Creedmoor Forged Upper 20in 1:8 Twist MLOK Complete w/BCG
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    BCA AR-10 6.5 Creedmoor Forged Upper 20in 1:8 Twist MLOK Complete w/BCG

    $399.99
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    BCA AR-10 .308 Win Forged Complete Upper w/BCG 24in 416R SS Light-Weight Barrel 1:10 Twist
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    BCA AR-10 .308 Win Forged Complete Upper w/BCG 24in 416R SS Light-Weight Barrel 1:10 Twist

    $369.99
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    BCA AR-15 7.62×39 Side Charger Complete Upper w/BCG 16in 416R Stainless Bear Claw Fluted
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    BCA AR-15 7.62×39 Side Charger Complete Upper w/BCG 16in 416R Stainless Bear Claw Fluted

    $349.99
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    BCA AR-15 5.56 NATO Complete Upper w/BCG 22in 416R SS Heavy Barrel
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    BCA AR-15 5.56 NATO Complete Upper w/BCG 22in 416R SS Heavy Barrel

    $359.99
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    BCA AR-15 5.56 NATO Complete Upper w/BCG 22in 416R SS Flued Heavy Barrel
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    BCA AR-15 5.56 NATO Complete Upper w/BCG 22in 416R SS Flued Heavy Barrel

    $369.99
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    BCA AR-15 Pistol 5.56 NATO Complete Upper w/BCG 7.5in Barrel 416R SS M4 Barrel
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    BCA AR-15 Pistol 5.56 NATO Complete Upper w/BCG 7.5in Barrel 416R SS M4 Barrel

    $299.99
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    BCA AR-15 .223 Wylde Complete Upper w/BCG 20in Black Nitride Barrel MLOK
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    BCA AR-15 .223 Wylde Complete Upper w/BCG 20in Black Nitride Barrel MLOK

    $359.99
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    BCA AR-10 .308 Side Charger Complete Upper w/BCG 20in Black Nitride Heavy Barrel
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    BCA AR-10 .308 Side Charger Complete Upper w/BCG 20in Black Nitride Heavy Barrel

    $399.99
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    BCA AR-9 Complete Upper 9MM Luger Side Charger 10.5in 416R Stainless M4 Barrel
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    BCA AR-9 Complete Upper 9MM Luger Side Charger 10.5in 416R Stainless M4 Barrel

    $399.99
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    BCA AR-9 Complete Upper 9MM Luger Side Charger 5in M4 Barrel
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    BCA AR-9 Complete Upper 9MM Luger Side Charger 5in M4 Barrel

    $359.99
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    Aero Precision M4E1-T Complete Upper 16″ .223 Wylde Mid-Length Barrel SM12.7 Anodized APAR700304M9
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    Aero Precision M4E1-T Complete Upper 16″ .223 Wylde Mid-Length Barrel SM12.7 Anodized APAR700304M9

    $499.99
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    BCA AR-10 .308 Side Charger 24in 416R Stainless Light-Weight Complete Upper w/BCG
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    BCA AR-10 .308 Side Charger 24in 416R Stainless Light-Weight Complete Upper w/BCG

    $399.99
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    MCS AR-15 16in Complete Upper .223 Wylde Bronze Upper MLOK
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    MCS AR-15 16in Complete Upper .223 Wylde Bronze Upper MLOK

    $449.99
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    MCS AR-15 16in Complete Upper .223 Wylde Purple Upper MLOK
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    MCS AR-15 16in Complete Upper .223 Wylde Purple Upper MLOK

    $449.99
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    BCA AR-15 .410 Shotgun Side Charger Complete Upper 20in MLOK w/BCG
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    BCA AR-15 .410 Shotgun Side Charger Complete Upper 20in MLOK w/BCG

    $359.99
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    BCA AR-15 .223 Wylde Complete Upper w/BCG 18in 416R SS Black Nitride MLOK
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    BCA AR-15 .223 Wylde Complete Upper w/BCG 18in 416R SS Black Nitride MLOK

    $369.99
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    BCA AR-15 5.56 NATO Complete Upper 16in 416R SS Black Nitride MLOK w/BCG
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    BCA AR-15 5.56 NATO Complete Upper 16in 416R SS Black Nitride MLOK

    $349.99
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