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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AR-10 Complete Upper
7 products -
AR-15 Complete Uppers
33 products -
AR-9 Complete Uppers
3 products -
AR AK Parts, AR Upper Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA-15 .300 Blackout 16″ Stainless Black Nitride Fluted Heavy Barrel Complete Upper w/BCG Side Charger
$399.99This 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…
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AR AK Parts, AR Upper Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA AR-15 6.5 Grendel Complete Upper w/BCG 18in Stainless Heavy Barrel 1:8 Twist
$319.99BCA AR-15 6.5 Grendel Complete Upper w/BCG 18in Stainless Heavy Barrel 1:8 Twist
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AR AK Parts, AR Upper Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA AR-15 .22 Magnum (WMR) 20in Complete Upper w/BCG, Buffer, Spring
$319.99BC-22 | .22 Magnum (WMR) Branded Right Side Charging Upper | 20″ Black Nitride Heavy Barrel | 1:16 Twist | Blowback Gas System | 15″ MLOK
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AR AK Parts, AR Upper Parts, AR-10 Complete Upper, Complete Uppers, Gun PartsBCA AR-10 .243 WIN Side Charger Complete Upper w/BCG 24in 416R SS Light-Weight Barrel
$429.99This BCA AR-10 complete .243 rifle length upper has a 24″ 416R Stainless Steel Light-weight barrel, and features a 1:8 twist rate, with a rifle length gas system. This upper…
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AR AK Parts, AR Upper Parts, AR-10 Complete Upper, Complete Uppers, Gun PartsBCA AR-10 6.5 Creedmoor Side Charging Handle 22in 416R SS w/BCG Complete Upper
$339.99BCA 6.5CR 22″ SL RSC CUPPER
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AR AK Parts, AR Upper Parts, AR-10 Complete Upper, Complete Uppers, Gun PartsBCA AR-10 Complete Upper w/BCG .243 Winchester Forged 20in. Heavy Barrel 15in. MLOK
$379.99BCA AR-10 Complete Upper w/BCG .243 Winchester Forged 20in. Heavy Barrel 15in. MLOK
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AR AK Parts, AR Upper Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsComplete 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
$399.99This 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….
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AR AK Parts, AR Upper Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA AR-15 .22ARC Complete Upper 24in 416R SS Heavy Barrel w/BCG, Charging Handle MLOK
$399.99BCA AR-15 .22ARC Complete Upper 24in 416R SS Heavy Barrel w/BCG, Charging Handle MLOK
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AR AK Parts, AR Upper Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA AR-15 .22ARC Side Charger Complete Upper 18in 416R SS Heavy Barrel w/BCG, Charging Handle
$399.99BCA AR-15 .22ARC Side Charger Complete Upper 18in 416R SS Heavy Barrel w/BCG, Charging Handle
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AR AK Parts, AR Upper Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA AR-15 .22 ARC Side Charger Complete Upper 20in 416R SS Heavy Barrel w/BCG, Charging Handle MLOK
$399.99BCA AR-15 .22 ARC Side Charger Complete Upper 20in 416R SS Heavy Barrel w/BCG, Charging Handle MLOK
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AR AK Parts, AR Upper Parts, AR-9 Complete Uppers, Complete Uppers, Gun PartsBCA AR-9 9MM Luger Bufferless Complete Upper 5in w/BCG MLOK
$329.99This BCA AR-15 complete 9MM pistol length bufferless (Patent Pending) upper has a 5″ M4 barrel with a parkerized finish, and features a 1:10 twist rate, with a blow back…
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AR AK Parts, AR Upper Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA Complete AR-15 Upper w/BCG .22 LR Right Side Charging Upper | 16″ Black Nitride Heavy Barrel | 1:16 Twist | Blowback Gas System | 15″ MLOK
$329.99BCA Complete AR-15 Upper w/BCG .22 LR Right Side Charging Upper | 16″ Black Nitride Heavy Barrel | 1:16 Twist | Blowback Gas System | 15″ MLOK
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AR AK Parts, AR Upper Parts, AR-10 Complete Upper, Complete Uppers, Gun PartsBCA AR-10 Complete Upper w/BCG 22-250 Right Side Charging Upper | 24″ Black Nitride Light-weight Barrel | 1:14 Twist | Rifle Length Gas System | 15″ MLOK
$369.99BCA AR-10 Complete Upper w/BCG 22-250 Right Side Charging Upper | 24″ Black Nitride Light-weight Barrel | 1:14 Twist | Rifle Length Gas System | 15″ MLOK
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AR AK Parts, AR Upper Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA AR-15 Complete Upper w/BCG .400 Legend Upper | 18″ Parkerized Heavy Barrel | 1:16 Twist | Carbine Length Gas System | Talon 15” MLOK Split Rail
$339.99.400 Legend Upper | 18″ Parkerized Heavy Barrel | 1:16 Twist | Carbine Length Gas System | Talon 15” MLOK Split Rail
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AR AK Parts, AR Upper Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA AR-15 5.56 NATO Bolt Action Complete Upper w/BCG, Charging Handle
$399.99BCA AR-15 5.56 NATO Bolt Action Complete Upper w/BCG, Charging Handle
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AR AK Parts, AR Upper Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA AR-15 Complete Upper .22LR Side Charger 416R SS 10.5in Barrel w/BCG Charging Handle
$319.99BCA AR-15 Complete Upper .22LR Side Charger 416R SS 10.5in Barrel w/BCG Charging Handle
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AR AK Parts, AR Upper Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA AR-15 Complete Upper .22LR Side Charger 7.5in Barrel MLOK w/BCG and Charging Handle
$299.99BCA AR-15 Complete Upper .22LR Side Charger 7.5in Barrel MLOK w/BCG and Charging Handle
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AR AK Parts, AR Upper Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA AR-15 .22 ARC Complete Upper w/BCG 20in Heavy Barrel 1:7 Twist 15in MLOK
$399.99BCA AR-15 .22 ARC Complete Upper w/BCG 20in Heavy Barrel 1:7 Twist 15in MLOK
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AR AK Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA AR-15 Pistol .300 Blackout Complete Upper w/BCG 4.5in Heavy Barrel MLOK
$349.99BCA AR-15 .300 Blackout Complete Upper w/BCG 4.5in Heavy Barrel MLOK
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AR AK Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA AR-15 Pistol 5.56 NATO Complete Upper w/BCG 4.5in Heavy Barrel MLOK
$349.99BCA AR-15 Pistol 5.56 NATO Complete Upper w/BCG 4.5in Heavy Barrel MLOK
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AR AK Parts, AR Upper Parts, AR-10 Complete Upper, Complete Uppers, Gun PartsBC-10 | 6.5 Creedmoor Forged Upper | 24″ Black Nitride Light-weight Barrel | 1:8 Twist | Rifle Length Gas System | 15″ MLOK Split Rail | with BCG & Charging Handle
$399.99This BCA AR-10 Complete Upper has a 24″ Black Nitride light-weight barrel, and features a 1:8 Twist Rate, a Rifle length gas system. This upper features our lightweight barrel profile…
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AR AK Parts, AR Upper Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA AR-15 .300 Blackout Complete Upper w/BCG 16in SS Black Nitride 1:8 Twist
$339.99BCA AR-15 .300 Blackout Complete Upper w/BCG 16in SS Black Nitride 1:8 Twist
- AR AK Parts, AR Upper Parts, AR-10 Complete Upper, Complete Uppers, Gun Parts
BCA AR-10 .308 Win Forged Complete Upper w/BCG 24in 416R SS Light-Weight Barrel 1:10 Twist
$399.99BCA AR-10 .308 Win Forged Complete Upper w/BCG 24in 416R SS Light-Weight Barrel 1:10 Twist
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AR AK Parts, AR Upper Parts, AR-15 Complete Uppers, Complete Uppers, Gun PartsBCA AR-15 7.62×39 Side Charger Complete Upper w/BCG 16in 416R Stainless Bear Claw Fluted
$349.99BCA AR-15 7.62×39 Side Charger Complete Upper w/BCG 16in 416R Stainless Bear Claw Fluted
