background I am getting a new sig 320 x5, its on order just waiting for it to arrive. question is do I get the vortex viper or the romeo red dot. I know the romeo comes with the correct adapter, but Midway has the viper on sale for $179, the romeo best price is $300. Anyone have any experience with either? FYI I planning on using this to shoot carry optics for steel challenge and possible uspsa.