Selling price for a CP HPR and Shaft3 barrel backs??

[Orion3]

Got a nice blue Dye threaded CP reg thats collecting dust and a couple of brand new and never used Shaft3 backs (689, 685) in Champagne.

The CP reg was fairly new and came of a marker I never got to shoot and the backs were purchased last month....before I shot a Un1tech!! £50 new.

What would be sensible prices for them?

Cheers

 

[Lump]

cp reg £30 and the two backs still worth £50 id say