If you have the extra cash I suggest buying new, and locally. That will give you the confidence in a working gun with customer service to back it up. Personally I would pay about $175-200 for a used Zenith in good condition if I didn't have the option of buying new for a similar price. Also beware that buyer has zero feedback and a very recent join date. Be cautious and avoid a scam. Good luck. Search for other similar B/S/T threads and see what other Zeniths have gone for recently.
All It Really Takes...Is One Shot To Get Them Out....Then 5 More To Let The Ref Know