To take apart the Gecado .25 caliber rifle, you will begin by making sure that the rifle is not loaded. Remove the retaining pin at the base of the barrel and remove the barrel.
around 75 dollars in gc
You need a gunsmith
25-65 USD
Blue Book of Gun Values will help.
GECADO was a tradename of inexpensive handguns marketed by a firm in West Germany, mainly in the 1950s and 60s. The firearms were made by multiple other companies, typically in Eibar Spain. Values are typically in the $25-$75 range.
Inexpensive .25 automatic of indifferent quality. Values typically less than $100.
It was not designed for 25 cal ammunition.
have a gunsmith do it for you, and you will note the steps involved.
Follow instructions in owner's manual
The question can't be answered without knowing the exact 25 cal you are referring to.
You will need the services of a gunsmith
25-50