Shop 4,462 Deals on Upper Receivers

CMMG BBL 308WIN 12.5-inch MC 416SS SBN

Lead & Steel Just As Good 18" Upper 5.56x45mm 1:7 Free Float M-LOK Mid-Length, OD Green

Sons of Liberty Gun Works M4-89 Complete Upper M489UPPER-9-300, 300 Blackout, 9 in Combat Barrel

Nordic Components Barrel NCBBL-9-85-BLK, 9MM, 8.5 in, 1:10 Twist, Black Finish NCBBL-9-85-BLK

Aero Precision AR-15 M4E1-E Upper Assembly 6.5 Grendel 20" Barrel 15" EM Gen2 Enhanced Handguard Black

Charles Daly AR 410 Complete Upper, 410 Gauge, 19 in Barrel, Black Finish, 1 Magazine, 5Rd CF500.219

Sons of Liberty Gun Works East India Starter Kit CHF V2 13.9in 5.56mm Black

Aero Precision Complete Upper Receiver M4E1 Threaded PRO 5.56 12.5in Barrel Gov Profile Mid-Length Gas System 1-7 Twist 1/2 x 28 Thread ATLAS R-ONE

Aero Precision AR-15 M4E1-E Complete Upper Assembly 5.56x45mm NATO 8" Barrel 7.3" ATLAS R-ONE Handguard Black

Mega Arms Forged Upper Receiver AR-15 Hard-Coat Anodized Black

CMMG Dissent Mk4 5.56mm 16.1in Upper Group 1-7 Twist 1/2 X 28 TPI .750in 25.5in Anodized Black

CMMG Endeavor 20" Upper .22 ARC with 1:7 Twist Rate and M-LOK Rail - Rifle-Length with BCG and CH - Sniper Gray - 28B3D0CSG

Lead & Steel All Rounder 5.56mm 13.9in Upper Reciever Group Mid-Length 1-8 Twist A1/ A2 Flash Hider Earth

Aero Precision M4E1 AR-15 Barreled Upper Receiver 6.5 Grendel 20" Barrel

Cobalt Kinetics CK-Pro Urg 5.56x45mm NATO 13.70" Black Cerakote Receiver

Aero Precision M4E1 Threaded Upper Receiver Assembled AR-15 Aluminum Olive Drab

LBE Unlimited M4 Stripped Upper Receiver, Fits AR15, Black Finish ARSTUP

CMMG DISSENT Mk4 300BLK 16.1in Upper Receiver 1-7 Twist 25.5in 5/8x24 TPI .750in Anodized Black

VKTR Industries Stripped Upper Receiver

Sons of Liberty Gun Works Broadsword-89 Upper Half 18in 6mm ARC Precision Barrel BS UPPER 16.75in M89 Rail Optional To AddMuzzle Device BCG or CH

Sons of Liberty Gun Works East India Starter Kit CHF V2 12.5in 5.56mm Black

LMT Defense MRP-L M-LOK SPECWAR Assembled Upper 5.56

Sig Sauer MCX-Spear LT Upper/Conv. Kit 7.62 X 39 16 Barrel

Colt Firearms M16 Stripped Upper 5.56 20 Barrel