have a gunsmith do it for you, and you will note the steps involved.
Astra - event - happened on 2010-04-25.
Follow instructions in owner's manual
You need a gunsmith
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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To take apart an Astra 200 Firecat, first ensure the gun is unloaded and safe. Begin by removing the magazine and then the slide by pulling it back slightly and lifting it off the frame. Next, you can disassemble the recoil spring and barrel by pushing the spring guide down and removing it, followed by sliding the barrel out of the slide. Be sure to consult the manufacturer's manual for any specific instructions or safety precautions.
There are no multiples of 154 that are 25 apart.
75-300 USD
50-150
20-200 USD or so