I sold a very nice Belgian SCAR17 with an OD receiver just under a year ago. The days of $3k+ resale SCARs are over, for now.
As mentioned above, part everything out and never sell as a bundle. That never works unless you are selling collectible stuff to a collector with money.
$2600-2700 is what you will probably be able to net for the rifle in stock config with 1-3 magazines after a patient sale. You'll receive a lot of interest, lowball offers in the $2300-2500 range, and strange multi-part trade offers. A whole lot of people want a SCAR 17, but few want to pay for it. Prospective buyers will cite the prices they can get on a new, US made SCAR to try and negotiate you down, but you both know they really want yours...
Mine sat for months before going for $2800.
Try other forum EEs if you want a higher serious-buyer-to-noise ratio.