I'm assuming this is a sear gun, not a push-pin RR, or RR with clip-on lower.
The sear alone is worth about $6k, the host gun $2000-2800 depending on condition. Now add in the cost of the scope, mags and bipod. You're probably looking at a about $9k-9.5k.
If its a RR w/a clip-on lower, a little less; if a RR with a push-pin lower, a little more.