Be a registered user and log in to GunBroker.com. Then you can use the Advanced Search tab and search completed auctions to see what similar rifles have actually sold for. Ignore asking prices and auctions that didn't sell.
Off the top of my head without more info and better pics, $1500 if selling locally. Perhaps more if on a national forum like gunbroker, but the additional hassles and risks of dealing with an out of state buyer and shipping to an FFL, and losing a cut to GB, etc.