Appears on Diagrams (4)

• Empire BT 4 - Combat, Delta, ERC, Assault, Iron Horse, SWAT, Banshee Diagram — #18 “Lower Receiver Nut”
• Empire BT 4 E-Grip Diagram — #03 “Lower Receiver Acorn Nut”
• Empire BT Delta Diagram — #18 “Lower Receiver Nut”
• Empire BT Omega Diagram 2012 — #84 “Lower Receiver Acorn Nut”