Dark Storm DS-15 Builder Box Featureless 223 Remington/5.56 Non-Threaded Lower

RUGER AR556 5.56 NATO AR15 Stripped Lower Receiver - Black

AERO PRECISION M4E1 Stripped Lower Receiver | Kodiak Brown Anodized

Radian Weapons A-DAC 15 Ambi AR-15 Lower Receiver

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

DPMS Complete AR-15 Lower Multi Cal w/ Pardus Stock 60660

Combat Armory AR-15 Billet Stripped Lower Receiver

TacFire AR-15 .223 / 5.56 Unassembled Upper Receiver Kit - 14.5"