I'll hold my hand up and say that firstly it was me who flagged up the ad, no salt is given, it's not us who won't sell a £130 pistol for £700.
"Not jumping to conclusions without knowing anything", it's your sales ad, maybe you could have put more information in so personal conclusions weren't needed?
I have never heard about tuning for accuracy on a gun, what is there you can actually affect other than the hop up?
I appreciate you have gone to extensive lengths on the Capa but really do think you're going to struggle selling as a complete piece for the money you are doing. May have a lot more luck taking your time and splitting it down and the parts off and then the pistol in it's stock format. Yes you're leaving the sport and undoubtedly want a quick and easy out but I'm 99% certain you won't get that with what you're doing.