Kral Arms Kral Puncher/ Gamo Urban SSG

Can anyone point me to a good spring size to purchase for an inner hammer spring "spring" for a basic SSG for a Kral Puncher series or Gamo Urban?

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Thanks in advance!
 
Id go straight to @thammer for all things Kral, and here is a place you can get some parts for Gamo/BSA. Be aware there might be a tariff charge, and the UK has some strange laws so they wont ship some parts to the US.