AMERICAN TACTICAL IMPORTS Galeo Lower Receiver 5.56x45 Black Parkerized AR15

AERO PRECISION M4E1 Stripped Lower Receiver | Kodiak Brown Anodized

AERO PRECISION M4E1 Complete Multi-Caliber AR15 Lower Receiver w/ Magpul STR Stock - Black

Geissele Automatics 5.56 USASOC Improved Complete Near-Clone AR-15 Upper Receiver - Desert Dirt- 10.3" - Open Box

BATTLE ARMS Authority ELite Upper Recv 5.56 10.5" AR-15 Gray

Ghost Firearms M4 Elite Complete Upper Receiver - 5.56 NATO - FDE - 16"

GREAT LAKES FIREARMS Complete AR15 Pistol Lower Receiver Braced Black

Sons Of Liberty Gun Works M4-89 11.5" 5.56 NATO Barreled Upper Receiver Group - FREE SOLGW Ambi Charging Handle - BLEM