Bsa spitfire 10 multishot

HI!
In new to air rifles but i bought a BSA spitfire 10 multishot. It seems to be a nice rifle but it does not have much power.
I live in sweden and we have a law that sets the max joule to 10 and 199ms.

I saw that in other countrys it has 26joule and 310ms

Does anybody know how they have restricted the power.
I saw that the Hole thats meets the barrer is very small but maybe its fine be that way.

I hope you understand my bad english🫣

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Whisper fusion mach1 .22.

Yours i guess i never seen the transfer port made that way.. that's new to me seeing that ..

Closest thing but interchangeable

 
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