Gray Ops CNC MPA Speed Nut Black. The Speed Nut allows for quick removal of the cheek riser and the recoil pad from your chassis. Adjusting and cleaning your MPA chassis will never been easier Specifications for Gray Ops CNC MPA Speed Nut: Manufacturer: Gray Ops CNC Color: Black Fabric/Material: 6061 Aluminum Last Chance: Yes Features of Gray Ops CNC MPA Speed Nut 100percent CNC machined Hardcoat Anodized Ships with Install Tool Ships with spare ball bearing Package Contents: Gray Ops CNC MPA Speed Nut Gray Ops CNC GO-MPASN: MPA Speed Nut Black