On another site, I have been following the development of two similar products that claim to cut mini groups in half. Many on that site have purchased these items and swear by them. They are a stabilizer bar/strut that clamps to the barrel and the gas block, providing a rigid platform for the thin mini barrel. I believe that these in addition to a trigger job and bedded stock will provide mini owners with a MOA shooter that Ruger should have produced in the first place.
Their sites-
www.accu-strut.com -$75, comes with Loc-tite, available in blued
www.rogco.biz (Har-Bar) -$100, thicker clamps, available in SS or blued
BTW- the site I found these on is the biggest mini forum I have found with excellent tips, advice and knowledge for the mini shooter. I'll post it if it doesn't violate the rules here. Does it?