The popular Springfield Hellcat & Hellcat Pro features a proprietary rail that prevents standard rail-mounted accessories from fitting. This CTL Custom was designed specifically for Glock Standard Frames by the expert engineers at Viridian. Viridian maintains collaborative relationships with major gun manufacturers, allowing for the ultimate custom fits on the C Series and the extensive line of red and green E Series. No one has more custom-fit accessories than Viridian, and nobody does it better.