Valuation estimate wanted - Tokyo Marui KSG - mint and boxed

[1967PF44]

Hi, I’m just after a valuation for a new/unused TM Tokyo Marui KSG gas shotgun.

Obviously it only has a second hand value - but this is straight from the shop in appearance 

Any help would be appreciated shotguns/gas stuff is not my area of expertise , lol and I am just about to list this for sale - probably 

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