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First of all it must be legal in the country where you live to make this modification. Second I would contact Gamo and ask them directly for the parts list.
around $150
Gamo extreme hunter
I don't believe that Gamo it still making the Hunter Sport anymore. But It may still be in stores. The Crosman Phantom 1000 has great reviews but I would lean towards the Gamo as my choice. But it's all up to you.
The shape, weight and size of the pellet all effect the ballistics of the shot. Each of these factors plus outside temperature and wind effect the distance the pellet travels. Therefore there is no set distance. Remember, after the high point of the pellet shot curve the pellet begins to loose its momentum and penetration.
If your in the United States, then I would check with "Craigslist" or "Guns America" on the web.
If you disassembled it you may want to contact Gamo directly and see if they can help you with a diagram. Call 954-581-5822 Gamo Customer Service. Unlike Crosman who post schematics for all their guns and rifles, Gamo and Daisy does not. Your next best shot is to check the web for an "Air gun repair" shop and send it to them for assembly and repair.
pyramydair.com is probably the largest dealer that I know of that deals in air guns. I suggest you go online to there web page and click on "Compare" next to each air rifle you want to know about. The chart will give you all the spec's on one page. This should help you make a better informed decision.
Aurelio Gamo's birth name is Aurelio Gamo Perucha.
What condition is it in? without some sort of description about the condition, it is not possible to answer you. Is it in Poor, Fair, Good, Very Good or Excellent condition.
What is a gamo del tamatic? I can not find any information on it.
Kin'ichiro Gamo has written: 'Mohitori no Izumi Kyoka'