S410 carbine full set up valuation

[jdk1]

I am using my rimfires more now so my S410 is just not getting used so I am thinking of selling it as a full set up and would appreciate an idea of what price to put on it ? , Many thanks in advance

S410 carbine .177 (pre anti tamper) regulated (no idea what regulator, fitted by former owner) , aftermarket trigger (again fitted by former owner but looks very much like a rowan engineering one) , mattysw silencer , cheapy bipod , nikon prostaff bdc 3-9x40 scope , walnut sporter stock plus thumbhole stock fitted with an adjustable butt pad , foster quick fill nozzle , 7lt (out of test but with lots of air in) best fittings cylinder c/w gauge and whip , 3 mags and 2 single shot adaptors

This shoots nicely with no known faults and I was told by the previous owner he had resealed it all , this would be strictly collection only.