OPF-G, EFLX (Optics Platform, Forward Controls, EFLX ) is compatible with EOTech's new EFLX sight. OPF-G, EFLX uses the same proven design of the OPF-G, RMR to keep the EFLX immobile, the simplest and most effective way to prevent sight to plate mounting screws from loosening and shearing. While EFLX uses 4 recoil lugs (twice as that of the RMR's) and beefier mounting screws, the challenges of keeping the sight on the plate without loosening or shearing the sight to plate screws are not very different from those of the RMR. OPF-G, EFLX has a front and rear fence, the tight tolerances of the plate to slide, and sight to plate insures minimum movement along the bore in recoil.