Accu strut, trigger job and bedding the action will probably give you the most improvement in accuracy from your Mini. Some of the 580 series rifles I believe came with left over pencil barrels and the rest came with the new and improved heavier barrels, all the 581 and up rifle have the newer heavier barrel. I've also heard that a flash hider/muzzle break will help tone down the barrel harmonics a bit.
Stu
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