5.56x45mm NATO Upper Receivers

WMD Guns AR-15 5.56x45mm NATO 16in M-LOK Upper Receiver Assembly - Left Hand 12in Handguard NiB-X Silver

WMD Guns Upper Assembly Forged AR-15 MLOK HG 15in NiB-X Nickel

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

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

WMD Guns AR-15 Threaded Stripped Upper Receiver - SLAB Style NiB-X Left Hand Silver

Colt 223 Rem/ 556 NATO M4 Feed Ramps Upper Black

FN USA FN 15 Military Collector Series M16A4 Complete Upper Receiver Assembly 5.56mm 20" Barrel

Aero Precision AR15 Barreled Upper 16" 5.56 M4 Carbine Barrel w/FSB & M4 Handguard

DPMS DR-15 Oracle II Slick Side Complete Upper 5.56 NATO 16" M-LOK

One Horse Complete Upper Receiver 5.56 NATO 10.5" with BCG and Charging Handle

TacFire Stripped Upper Receiver for AR-15 5.56x45mm

TacFire AR-15 Complete Built Upper 5.56 NATO 16"

TacFire AR-15 Complete Built Upper 5.56 NATO 10.5"

TacFire AR-15 Complete Upper 5.56 NATO 7" Barrel Black with Bolt Carrier Group

TacFire AR-15 Complete Upper 5.56 NATO 5" Barrel Black with Bolt Carrier Group

TacFire AR-15 Complete Upper 5.56 NATO 16" Barrel Black with Bolt Carrier Group

TacFire AR-15 Complete Upper 5.56 NATO 11.5" Barrel Black with Bolt Carrier Group

TacFire AR-15 Complete Upper 5.56 NATO 10" Barrel Black with Bolt Carrier Group

Anderson Manufacturing AM-15 Stripped Upper Receiver Black

ATI AR15 Multiple Caliber Stripped Metal Reinforced Polymer Upper Receiver

ATI Milsport AR-15 Complete Upper 16" Barrel with 15" M-LOK Rail

AR-STONER AR-15 Sporter Billet Upper Receiver Stripped with 13" M-LOK Handguard Aluminum Black

AR-STONER Left Hand Stripped AR-15 Billet Upper Receiver Aluminum Black with Bolt Carrier Group

AR-STONER AR-15 Enhanced Build Kit with Upper Receiver Assembly 5.56x45mm NATO 16" Barrel Mid Length 15" M-LOK Handguard, Complete Lower Parts Kit with Magpul MOE Furniture and Sight Set Black