Ripoff! The rifle isn't worth 2k for starters and its used. The optic is junk, the weights are unnecessary, the target grip is unnecessary, without a brand name the value of the scope mount is unknown. Who's trigger? The bipod isn't necessary and can be had new for a few dollars more. The recoil reducer is a waste of time. The mags he over paid for by a large margin. Cleaning kit is basic and the manual can be had online for free.
With current options out there I wouldn't offer more than 12-1400 for it. Figure out what you need then what you want and determine a price from there.
If you're looking to do some run and gun an hbar is a horrible idea. Too long and far too heavy.
Tdc