Well, a new R93 in the least expensive configuration (Professional, i.e. synthetic stock) usually sells for over $3100. The Blaser scope mount base only (no rings) is $565 on Wolverine's site right now (no indication as to whether this is for the QD version or not), and the last time I saw rings they were just under $300. I have no idea about the case, but it ain't gonna be cheap.
So, assuming the gun is in excellent condition, I'd say this is a great deal. I admit I'm biased; I'm a Blaser fan in general, and think that the R93 specifically is one of the finest hunting rifles available. If you don't like it (anything is possible...), you won't lose any money selling it.