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...
"del" is the combination of the words "de" and "el".
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Gamo's ( Air Guns/Rifles ) are made in Spain. If you want to see their home page click on the link below.
Usually, by reversing the steps taken to disassemble it. For a more detailed answer, write a more detailed question, starting with the make and model.