I remember back when I was 18 or so, those guns would sell new for around $425-450. I honestly wouldn't consider the aftermarket stock, scope or mags adding to the price. If it's configured like that, they're probably cheap. The only way the mags would carry merit is if they're actual Ruger mags, doubt they are... don't think they made anything bigger than a 5rnd for the 30.
On another note, I have issues spending big money for a rifle in 7.62x39. The Mini-30s are reliable, but they're not very accurate and you're in SKS/AK territory, which can either be purchased at a fraction of the cost or have a wider community support with cheaper accessories. If you want it and it's in good condition, offer $500 and walk away. Otherwise, grab a cheap AK and have fun with it.
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