Ambidextrous

Not really feasible as the guts of the action that index the magazine are on the left under a plate and cocking lever on right side. When I shoot anything on bag, easy enough to cock right handed. For lefty offhand I have my full lefty Rapid. I'm a left eye dominant shooter though I much prefer ambidextrous stocks & universal cocking. 

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If you want anything done to a Rainstorm or any other Korean airgun, Will Piatt of Saddle Mountain Gunsmith is the "go to" man for anything that can or need be done to them. 
I had 4 Rainstorm rifles and 2 Sumatras. One RS had a very nice QD FF addition made by Will. Was $175 at the time. Last I heard now $125.00. 
If it could be done Will is who you want to talk to.

https://sites.google.com/site/saddlemountaingunsmith/home

https://www.airgunnation.com/topic/will-piatt-a-service/