1 × NBS Mil-Spec M4 Carbine Stock; 1 × Discount Mil-Spec Carbine Buffer / Receiver Extension Kit

1 × Discount Mil-Spec Carbine Buffer / Receiver Extension Kit; 1 × ODIN Works Complete Lower Parts Kit

1 × NBS Mil-Spec M4 Carbine Stock; 1 × Discount Mil-Spec Carbine Buffer / Receiver Extension Kit; 1 × OEM Mil-Spec AR-15 Lower Parts Kit

1 × Aero Precision AR-15 Assembled Upper Receiver; 1 × Aero Precision AR-15 Stripped Lower Receiver – Black

3 × Anderson Manufacturing AM-15 Stripped Lower Receiver – Open – Anodized Black

1 × B5 Systems BRAVO Black Mil-Spec Stock – OEM; 1 × Discount Mil-Spec Carbine Buffer / Receiver Extension Kit