Griffin Armament MK1 AR-15 Lower Receiver - Stripped Lower

Timber Creek Outdoors AR Lower Parts Kit for AR-15, Robin's Egg Blue - AR LPK RE

GRIFFIN ARMAMENT MK1 AR-15 Stripped Lower Receiver (MK1SL)

RUGER AR556 5.56 NATO AR15 Stripped Lower Receiver - Black

Timber Creek Outdoors Greyman AR15 Lower Parts Kit - Stealth

Timber Creek AR-15 Lower Parts Kit, OD Green - AR LPK OD

RUGER 7075-T6 Forged Aluminum Black AR Stripped Lower (28500)

BLEM Griffin Armament MK2 Ambi AR-15 Lower Receiver, Terra Brown