The Razorback was reintroduced for the last months of 2014, as a 2015 revival of the pistol due to demand for DW to produce a 10mm of significant quality again. This was indeed also the genesis of the Silverback, as krausb so helpfully illustrated above.
Both are on the menu for our backorders. As Dan Wesson is still quite slow to produce pistols owing to their much lower production and higher quality focus and the backlog generated by their factory fire a few years back during the height of the US buying panic, coupled with requests for these pistols, we do not expect many of these pistols to come up for sale as retail inventory in 2015. If you are interested in either a Silverback or a Razorback, please feel free to contact us and we'd be happy to have our purchaser poke and prod at Dan Wesson Firearms to figure out when we will see one with your name on it.
Cheers,
Daniel