Really, you can't find anything about them on line, it took me 30 seconds, and that only because i'm slow at typing, https://www.google.com/search?q=zap+zxs+500&oq=zap+zxs+500&aqs=chrome..69i57.6138j0j8&sourceid=chrome&ie=UTF-8
What more do you want to know, you now know what the make and model is, even though it was on the packaging in your picture, if you look at some of the sites in the link you'll find out how much they were selling for back in 2003 and also how much people have sold them for on ebay. What more do you need.
They are a basic mechanical gun based on the classic Spyder design.
There isn’t much value in them, but they are sound guns unlikely to have any problems if unused, other than if the O-rings have begun to perish from sitting dry for a decade or more
A bit of grease or a bag full of o-rings for a £1 or less will fix that
In the paintball community they are unlikely to sell other than for any nostalgia value. Local ads etc could get you some sales or drop them into an auction
If it's only their current value you're after the answer is not a lot, they were bottom end budget guns back in the early 2000's and they haven't become collectors items so no value there, the only people likely to buy them are people just starting out who don't know any better.
Probably worth more in scrap I would have thought?
Please dont be put off by ol' grumpy BOD over there! We're not all chewing bee's I promise.
Please dont be put off by ol' grumpy BOD over there! We're not all chewing bee's I promise.