Gents, a little help if you will.

I'm looking to move on some rifles I no longer use and need a bit of a hand with valuations. On Gunstar they seem to be stupidly priced but I am looking to sell my FTP 900 in excellent condition with no modifications, the only mark is on the bottom of the pistol grip and is not even visible, you really have to know where it is and have a good feel for it. It is a Gen 2 model made in September 2015.

No scope included, but it is cased in its original case and comes with all of its original bumph and I have a 7 litre tank with at least 2 years left on it. Like I say, on Gunstar the prices seem too high to me so I have no idea where to start.