AR Parts in 5.56x45mm NATO

Aero Precision AR-15 M4E1-E Barreled Upper Receiver 5.56x45mm NATO 10.5" Barrel 9.3" EM Gen2 Enhanced Handguard Flat Dark Earth

LMT Defense MRP-L M-LOK Railed Upper 5.56x45mm/.300 AAC Blackout/6.8 SPC no BCG&CH, Black

Phase 5 Weapon Systems Inc Magazine Release Button OD Green

Phase 5 Weapon Systems Inc Magazine Release Button Phase 5 Grey Small

Phase 5 Weapon Systems Inc Magazine Release Button Phase 5 Blue Small

Phase 5 Weapon Systems Inc Hexone Pistol Buffer Tube Black HEXONE

TROY A4 COMPLETE UPPR 556 16"

Optics Ready AR-15 A3 Pistol U

Troy Industries SOCC Battle Ra

Adams Arms P1 Upper 5.56 NATO / .223 Rem 16 Barrel

Luth-ar C7 Retro Complete Upper OD Green 5.56 20 Threaded Barrel

LUTH-AR BA-F20C77CB A1 C7 MOD RTR COMP UPP BRL

JE Machine L Style M-LOK AR-15 Handguard 15" Black

Ar-15 Mil-Spec Bolt Carrier Group 5.56mm Left Hand

Faxon AR-15 Duty Series Gunner Upper Receiver Assembly 5.56x45mm NATO 16" Barrel Suppressor Ready

CMC Triggers Barrel 5.56 16 Threaded Barrel w/ Gas Block Gas Tube

CMC Triggers AR-15 Barrel 5.56 11.5 Threaded Barrel

White Label Armory AR15 Barrel 5.56 16 Barrel

White Label Armory AR15 Barrel 5.56 14.5 Barrel

White Label Armory AR15 Barrel 5.56 11.5 Barrel Government Profile

White Label Armory AR15 Barrel 5.56 10.5 Government Profile Barrel

CMMG Dissent Upper Group Mk4 5.56mm 6.5" Anodized Blk

CMMG 55BB40BMB Resolute MK4 5.56x45mm NATO 16.10", Midnight Bronze, M-LOK Free-Float Handguard for AR-Platform (No BCG or Charging Handle)

Fortis Camber AR-15 M-LOK Rail System - 11.8" w/ Midlength Cutout