I have a Mamba Lite on my FAC Superten as well as as normal Mamba on my Sako Finnfire. The Mamba Lite is a bit lower mag but works just as well as the Mamba. I'm pretty sure the Mamba is lighter than the Viper (and smaller without those damn great target turrets) and with the 1" tube the Mamba Lite is a lighter again. Despite having had a 6x42 Habicht previously on the Finnfire (which I love), I now have the Mamba on it and wouldn't go back to the Habicht simply due to the excellent SBC reticule and extra magnification the Mamba offers - and the optics are pretty good too in my opinion.