Crosman RM422

Ukabuke

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Location
Regina, Sask
I bought a Crosman RM422 air rifle thinking it would have pretty good shooting power (495fps, with a .22 pellet)
I'm actually finding it pretty weak. I'm wanting to replace the main spring with that from a RM522/622 hoping to result in a 825fps/.22

Anyone have an idea where I can purchase a replacement main spring?

Thanks in advance
 
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