we were discussing the vortex viper 2-7x 32 for the ar-15 set up the other day and it comes highly recommended by most shooters as a very high quality optic for it price.
the bad new was the scope was dropped by vortex a year or so ago and the supply of them dried up --@ $170 they sold out pretty quickly.
yesterday i may have got lucky SWFA had a new open box "B" viper BDC in their sample list for $159-- so i grabbed that puppy--LOL! if what i have been hearing about the vipers is true this was a hell of a deal--
we will see how it stacks up against the diamondback -- i suspect it shall do very well--