Shop 4,462 Deals on Upper Receivers

TacFire 5" Upper .300 AAC Blackout 1:7 M-LOK Rail, Black

Lantac .223 Wylde Patrol 14.5" Upper Receiver w/ Intermediate-Length Gas Tube 01-FA-223-PATROL-UPR

Aero Precision M5E1 Enhanced Upper Receiver .308 Win 18

Alexander Arms Hunter Complete Upper 6.5 Grendel 18 Barrel 10-Rounds

Tacfire 9mm 4.5" KeyMod Unassembeld Pistol Build Kit, Black - SSPK9MMLPK4K

Bushmaster QRC II LTW 16" Classic Upper 5.56x45mm NATO 1:7 Carbine Length, Black

Tacfire .300 Blackout 7.5" KeyMod Unassembeld Pistol Build Kit, Black - SSPK300LPK7K

Tacfire Build Kit for AR-15 45 ACP Complete Rifle, Nitride Black - SSRK45ACPLPK

LanTac Raven Barrel .300 AAC Blackout 11.5 1:8 Twist

CMMG Dissent 16.10" Upper .22 ARC with 1:7 Twist Rate and M-LOK Rail - Rifle-Length with Charging Handle - Coyote Tan - 28B940CCT

Aero Precision AR-15 M4E1-E Upper Assembly 5.56x45mm NATO 13.9" Barrel 12.7" ATLAS R-ONE Handguard Black

Tacfire Complete Pistol Build Kit for Semi-Auto Pistols, Black - SS-PK556-LPK

Colt Upper 223/556NATO 11.5 Inch Lightweight Barrel w/Integrated Rail

CMMG Banshee 9" Upper .22LR with 1:16 Twist Rate and M-LOK Rail - Armor Black Upper Assembly with BCG and CH - 22B8F8BAB

Colt Firearms LE6920CK-NHG Upper Kit Black 5.56NATO/.223Rem 16-inch

CMMG Dissent 10.50" Upper 5.56x45mm with 1:7 Twist Rate and M-LOK Rail - Pistol-Length with Charging Handle - Sniper Gray - 55B8D86SG

CMMG Upper Receiver Assembly, Armor Black

CMMG Dissent 6.50" Upper .300 AAC Blackout with 1:7 Twist Rate and M-LOK Rail - Pistol-Length with Charging Handle - Armor Black - 30B0E67AB

CMMG Banshee 8" Upper 5.7x28mm 1:9 M-LOK Carbine-Length, Black

Aero Precision M4E1 5.56mm M4 Carbine 16 Barrel Complete Upper Receiver

Larue Stripped Upper Receiver, Black

Radian Weapons Model 1 Complete Upper Brown .223 Wylde 17.5 Barrel

Lantac .223 Wylde Urban Tactical Pistol (UTP) 11.5" Upper Receiver w/ Mid-Length Gas Tube 01-FA-223-UTP-UPR

Aero Precision M4E1 Complete Upper .223 Wylde 18 Rifle Barrel