Geissele Automatics Super Duty Stripped AR-15 Receiver Set - OD Green

Battle Arms Development WH556-URS-ODG Workhorse Upper Receiver Aluminum OD Green Anodized Receiver for AR15/M4

APF AR-15 Stripped Billet Lower Receiver - Matte Black

Wraithworks Billet Slick Side AR-15 Upper Receiver - Black | No Forward Assist or Brass Deflector

Combat Armory AR-15 Billet Stripped Lower Receiver

MAMMOTH ARMS MAMMOTH ARMS A3 UPPER RECEIVER PARTS KIT CO

DMA Inc. XTS AR-15 Anodized Parts Kit - Green

AERO PRECISION AR15 5.56 NATO / 223 Rem 20" Complete Upper Receiver w/ Carry Handle | Black