Developing software that substantially improves MCNP analysis productivity, in 2019, Silver Fir Software acquired the Attila Product Line from Varex Imaging. Attila4MC features CAD integration for MCNP, an intuitive graphical user interface for calculation setup, CADIS, FW-CADIS variance reduction, and CAD-based solution visualization. Also included visualization through Tecplot 360, providing intuitive solution field insight and the tools to present results. The acquisition by Silver Fir Software represents a new chapter in the Attila Product Line. The mission of Silver Fir Software is to improve the productivity of users doing radiation transport simulations.