Several of big name outlets have been putting the Viper HS on sale, for a good price, but not the Dead Hold BDC model, just the V-Plex reticle. I compared the Diamondback HP to the Viper HS and decided there were more than enough of the same features that I ordered the Diamondback HP 4-16x42. Yeah, there won't be quite as much light since the objective is a few mm smaller, but I can live with that. It is going on my 6.5 Grendel AR.