Shop 4,483 Deals on Upper Receivers

Aero Precision Complete Upper Receiver M4E1-T .223 16in Wylde Barrel 15in M-LOK ATLAS S-ONE Handguard Cerakote Flat Dark Earth

CMMG Mk4 .300BLK Resolute Upper Group Receiver 16.1in Titanium

CMMG Mk4 .300BLK Resolute Upper Group Receiver 16.1in Coyote Tan

Guntec USA AR .308 Gen 2 Stripped Billet Upper Receiver Bronze

Guntec USA AR-15 Stripped Billet Upper Receiver Anodized Neon Yellow

WMD Guns AR-15 A3/A4 Upper Receiver Forged w/M4 Feed Ramps NiB-X Cobalt

WMD Guns AR-15 A3/A4 Upper Receiver Forged w/M4 Feed Ramps Stripped NiB-X Northern Lights 1-NIBXUF-Northern Lights

WMD Guns AR-15 A3/A4 Upper Receiver Forged w/M4 Feed Ramps Stripped NiB-X Jesse James Green 1-NIBXUF-Jesse James Green

Ammunition Storage Components AR-15 Billet Slick Side Upper Receiver 12in Free Float MLOK Handguard Combo Black

DEMO Aero Precision M4E1 Complete Upper Receiver AR-15 18 in Rifle Length Barrel 15 in M-LOK Handguard No BCH/CH Anodized Black

Spikes Tactical Upper 5.56 16in Midlength LE w/MOE BLK SL Handguard

Stag Arms AR-15 A3 Flattop Upper Receiver Assembly Direct Impingement Left Hand Cerakote FDE

Stag Arms AR-15 Tactical Right Hand Upper Receiver 5.56 NATO 10.5in Barrel GOV-CMV Profile 1-7 Twist 1/2 x 28 Thread VG6 Delta FDE

Spikes Tactical Upper 5.56 16in M4 LE w/10in M-LOK Rail

Aero Precision Complete Upper Receiver M4E1 .300 Blackout Barrel EM-12 HG No BCG/Charging Handle Gen 2 FDE Cerakote 16in APAR600232M14

Spikes Tactical Upper 5.56 11.5in FN CHF w/10in BAR2 Rail

Spikes Tactical Upper 5.56 8.1in CHF Barrel w/7in SAR3

Ghost Firearms Elite Complete Upper Receiver 7.62x39 16 inch Carbine Length 4150 Light HBAR Barrel 1-10 Twist 14 inch M-LOK Free Float Hand Guard A2

Grid Defense Complete Upper Receiver 5.56mm 10.5 inch Carbine Length 4150 Steel M4 Barrel 1-7 Twist A2 Flash Hider Tungsten Gray

Grid Defense Complete Upper Receiver 5.56mm 10.5 inch Carbine Length 4150 Steel M4 Barrel 1-7 Twist A2 Flash Hider Blue Titanium

Stag Arms AR-15 Tactical Upper Receiver 5.56x45mm NATO 16in Barrel Maryland Compliant Hanson Profile 1-7 Twist 1/2x28 Left Hand VG6 Delta Nitride

Stag Arms AR-15 Tactical Right Hand Upper Receiver 5.56 NATO 16in Barrel Maryland Compliant Hanson Profile 1-7 Twist 1/2 x 28 Thread VG6 Delta Nitride

Aero Precision M4E1 Threaded Complete Upper Receiver 5.56 11.5in Carbine Length 1-7 Twist 10.3in ATLAS S-ONE Handguard A2 Flash Hider Cerakote OD

Aero Precision M4E1-T Complete Upper Receiver 5.56mm 11.5in Carbine Length S-One M-LOK Handguard FDE