P
Pit-R
Maybe I'm wrong, but in my opinion Rubi's most similar series to Sigma's Max is current TP-S range (TI-S before). They're single rail cutters as well (TX are double rail ones). They look like Max and work like Max, and to be honest I would say Rubi almost copied sigmas. The only important difference is their rails aren't movable vertically. This is also probably first Rubi's range coming without cases (except their TI-S predecessors).