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 AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA-15 .300 Blackout 16″ Stainless Black Nitride Fluted Heavy Barrel Complete Upper w/BCG Side Charger
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…
CompareEarn 399 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA AR-15 .22WMR Side Charger Complete Upper 16in MLOK w/BCG
BCA AR-15 .22WMR Side Charger Complete Upper 16in MLOK w/BCG
CompareEarn 299 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA BC-15 .17HMR Side Charging Complete Upper w/BCG, 10rd Mag
BCA BC-15 .17HMR Side Charging Complete Upper w/BCG, 10rd Mag
CompareEarn 299 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA-15 7.62×39 AR-15 Pistol Complete Upper 7.5″ Barrel, 7″ MLOK Side Charger w/BCG
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…
CompareEarn 329 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
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
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….
CompareEarn 399 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA AR-10 .308 Side Charger 24in 416R Stainless Light-Weight Complete Upper w/BCG
BCA AR-10 .308 Side Charger 24in 416R Stainless Light-Weight Complete Upper w/BCG
CompareEarn 399 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
MCS AR-15 16in Complete Upper .223 Wylde Bronze Upper MLOK
MCS AR-15 16in Complete Upper .223 Wylde Bronze Upper MLOK
CompareEarn 449 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
MCS AR-15 16in Complete Upper .223 Wylde Purple Upper MLOK
MCS AR-15 16in Complete Upper .223 Wylde Purple Upper MLOK
CompareEarn 449 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA AR-15 .410 Shotgun Side Charger Complete Upper 20in MLOK w/BCG
BCA AR-15 .410 Shotgun Side Charger Complete Upper 20in MLOK w/BCG
CompareEarn 359 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA AR-15 .223 Wylde Complete Upper w/BCG 18in. 416R SS Black Nitride MLOK
BCA AR-15 .223 Wylde Complete Upper w/BCG 18in. 416R SS Black NItride MLOK
CompareEarn 349 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA AR-15 5.56 NATO Complete Upper w/BCG 16in 416R SS MLOK
BCA AR-15 5.56 NATO Complete Upper w/BCG 16in 416R SS MLOK
CompareEarn 299 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA AR-15 6MM ARC Complete Upper 18in MLOK 416R SS w/BCG
BCA AR-15 6MM ARC Complete Upper 18in MLOK 416R SS w/BCG
CompareEarn 399 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
Luth-AR LR308 A3 Assembled Upper Receiver with Charging Handle Anodized Black
Luth-AR has an upper receiver for your next build or upgrade. Made from aluminum and made to last it comes with the dust cover and a charging handle and is…
CompareEarn 179 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
Davidson Defense ‘Projected Power’ 4.5-inch AR-15 9mm Nitride Pistol Complete Upper Build
Davidson Defense ‘Projected Power’ 4.5-inch AR-15 9mm Nitride Pistol Complete Upper Build
CompareEarn 339 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA AR-10 .308 WIN Forged Complete Upper w/BCG 20in MLOK
BCA AR-10 .308 WIN Forged Complete Upper w/BCG 20in MLOK
CompareEarn 469 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA AR-15 5.56 NATO Side Charger Complete Upper w/BCG 20in 416R SS Black Nitride Bear Claw Barrel MLOK
BCA AR-15 5.56 NATO Side Charger Complete Upper w/BCG 20in 416R SS Black Nitride Bear Claw Barrel MLOK
CompareEarn 349 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA AR-10 6.5 Creedmoor Side Charger Complete Upper w/BCG 20in MLOK
BC-10 | 6.5 Creedmoor Right Side Charging Upper | 20” Parkerized Heavy Barrel | Rifle Length Gas System | 1:8 Twist | 15” MLOK Split Rail
CompareEarn 429 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA AR-15 6.5 Grendel Left Side Charging Complete Upper w/BCG 16in Barrel
BCA AR-15 6.5 Grendel Left Side Charging Complete Upper w/BCG 16in Barrel
CompareEarn 389 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA AR-10 .243 Win Right Side Charger Complete Upper w/BCG 22in Barrel
BCA AR-10 .243 Win Right Side Charger Complete Upper w/BCG 22in Barrel
CompareEarn 399 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA AR-15 .22LR Side Charger 16in Complete Upper w/BCG, Buffer, Spring
BCA AR-15 .22LR Side Charger 16in Complete Upper w/BCG, Buffer, Spring
CompareEarn 329 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA AR-10 .308 WIN Complete Upper w/BCG 18in MLOK
BCA AR-10 .308 WIN Complete Upper w/BCG 18in MLOK
CompareEarn 399 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BC-10 | .308 Right Side Charging Upper | 16″ Parkerized Heavy | 1:10 Twist | Mid-Length Gas System | 15″ MLOK Split Rail w/BCG
This BCA AR-10 complete .308 rifle length upper has a 16″ parkerized Heavy barrel, and features a 1:10 twist rate, with a mid-length gas system. It includes a 15″ MLOK…
CompareEarn 399 Points -
AR AK Parts, AR Upper Parts, Complete Uppers, Gun Parts
BCA AR-10 .22-250 REM Sporter Slid Side Complete Upper w/BCG 20in. Parkerized Heavy Barrel 1:14 Twist MLOK
BCA AR-10 .22-250 REM Sporter Slid Side Complete Upper w/BCG 20in. Parkerized Heavy Barrel 1:14 Twist MLOK
CompareEarn 419 Points -
AR Upper Parts, Complete Uppers, Gun Parts
BCA AR-15 Complete Upper w/BCG 7.62×39 Dual Charging Upper 10.5in Parkerized Heavy Barrel 1:10 Twist 9.5in MLOK
BCA AR-15 Complete Upper w/BCG 7.62×39 Dual Charging Upper 10.5in Parkerized Heavy Barrel 1:10 Twist 9.5in MLOK
CompareEarn 349 Points