Vortex 3x magnifier. Retails new for €239/~2500sek, if you can find it in Sweden. It is real steel, so it will NOT lose zero, has excellent eye relief and very clear glass. Glass is pristine, there is a tiny white scratch on body but it is just cosmetic.
Magnifier is covered by Vortex VIP Lifetime Warranty - if it is damaged or defective, Vortex will replace it for you, free of charge, forever, regardless of if you are the original owner or have the original box. This includes damage from Airsoft, so if it is shot out, you can easily get it replaced by Vortex for free.
Check here for more info: