have a gunsmith do it for you, and you will note the steps involved.
Astra - event - happened on 2010-04-25.
You need a gunsmith
Follow instructions in owner's manual
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.
You will need the services of a gunsmith
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There are no multiples of 154 that are 25 apart.
50-150
75-300 USD
20-200 USD or so
If you don't have an owner's manual, ask a gunsmith for help