Shop 4,464 Deals on Upper Receivers

Tiger Rock AR Rifle Kit Handguard 7.62x39 16in Barrel HBAR Carbine 1x10 Twist 5/8x24 Thread 10in Quad Rail Handguard Brake Nitride Anodized Black

CMMG Upper Group Dissent 45 Acp 16.1in 1-16 Twist 0.578 X 28 TPI 25.5in Titanium

XTS Complete Upper Receiver w/o BCG AR-15 300 BO 17.5in 8.5in Pistol 1-8 Twist 5/8x24 Thread M-LOK Bird Cage Black Nitride Finish Bronze

XTS Complete Upper Receiver w/o BCG AR-15 300 BO 17.5in 8.5in Pistol 1-8 Twist 5/8x24 Thread M-LOK Bird Cage Black Nitride Finish

XTS Complete Upper Receiver w/o BCG AR-15 300 BO 24.75in 16in Barrel Carbine 1-8 Twist 5/8x24 Thread M-LOK Bird Cage Black Nitride Finish Blue

Aero Precision AR-15 5.56x45mm NATO Complete Upper Receiver w/ No Forward Assist 11.5in 5.56 Barrel 9in M-LOK ATLAS R-ONE Handguard Anodized Black

Franklin Armory OPS-16 5.56 NATO 16in Piston Complete Upper Reciever Black

Primary Weapons Systems MK218 MOD1-M Upper Receiver 18in bbl .308 Match 3-Setting Adjustable Gas System PRC30 Compensator Black

Bowden Tactical AR-15 Rifle Build Kit 6.5 Grendel 16in Barrel 15in Handguard Flash Hider Black

Guntec USA AR-15 Stripped Billet Upper Receiver 15 in Air Lite Series M-LOK Handguard Combo Set Anodized Gold GT-UP-SET-GOLD-15AIRLITE

Next Level Armament Horus AR-15 9mm Luger 8 inch Upper Receiver Conversion Kit Black with 33 Round Magazine

American Defense Manufacturing 5.56 14.5 Inch Barrel M-Lok Rail Upper Reciever Midnight Bronze 14.5 in

Aero Precision M4E1-E EM15 Complete Upper 5.56 x 45 16inch HBAR Mid Length 1-7 Twist 1/2 x 28 Thread Cerakote FDE

Guntec USA AR-15 Trump Series Premium Limited Edition Furniture Set 24 Ct Gold Plated

Guntec USA AR-15 9mm Dedicated Stripped Billet Upper Receiver Clear

Guntec USA AR-15 5.56 Complete Ultralight Series Pistol Kit No Lower Black

Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 16 in RA-MK1-16-PU-BLK

Dark Storm Industries DS-15 .300 AAC Blackout 16in Non-Threaded Complete Upper Receiver ODG

Aagil Arms Ted Nugent's Signature Series AR-15 Complete .300 Blackout Upper Receiver Assembly w/ 15in Gun Black Cerakote

PSA AK-101 Side Folding Barrel Assembly - Furniture Ready

PSA AK-104 GF5 Barrel Assembly - Furniture Ready

USED Precision Reflex AR-15 Flat Top Upper Receiver - Striped FDE

Brn-180s Gen 2 10.5'''' 223 Wylde Wupper Receiver Assembly Fde - Brn-180s Gen 2 10.5'''' 223 Wylde Upper Receiver Assembly Fde

Quarter Circle 10 Side Charging Complete 9mm Upper Receiver Assembly 16in Barrel Black QC-CU-PSCU-G-9-16 Inch