There are very few aftermarket accessories/parts dedicated to the 15-22 yet, so no, there are no reduced power springs available.
This is one of those do-it-yourself projects.
The first thing I would do is get a replacement spring from S&W by e-mailing customer support and requesting one. I've received a replacement safety selector and charging handle, free, just by asking.
If you get a replacement, try removing some coils.
The other option is to find a similar spring elsewhere, ie. hardware store, possibly a spring from another firearm, etc..
I just wouldn't recommend messing with the stock spring until you have a factory replacement...
Good luck.
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