Idrivetrains, the Accustrut is the best thing you can do to an older skinny barrel Mini. If you don't ever do anything else for it at least put on the strut. Not only will your groups shrink by almost half, vertical stringing as the barrel warms up will be greatly reduced, and the strut will take some heat from your barrel so it stays cooler. A few suggestions, get the two clamp model. It is much more effective than the single clamp. The single clamp looks cool and more M-14 like, but is better used on the newer 580+ series that don't need near as much help as the 185 like you have.
Also, it helps to tie everything in together and further stiffen the barrel by doing the "dimple option". The Accustrut will have two set screws that tighten down onto the sides of the gas block. Tighten them down a little bit, then remove the strut, and where you see the mark on the gas block left by the two set screws, hit with a metal punch to keep the drill bit from skittering, and drill a shallow hole there ( 1/16th or so) with a bit a little smaller than the set screw size. This will give a place for the end of the set screw to nestle. This helps to tie in the barrel stiffening strut with something solid and helps the overall benefit of using a strut.
Finally, use blue Locktite on the clamp screws and the little set screws. You should never have to take the strut off again and with Lockite you won"t worry about screws getting loose. Just use Blue Locktite instead of red so you could take the strut off if you wanted to. If you want to do thorough cleaning once a year or so and clean the gas block and tube, you can take the gas block apart by removing the top of the gas block and keep the bottom of the gas block attached to the strut without separating them.
Get some Ruger 20 round magazines if you don't already have them, they are the best, and shoot good ammo, no steel case Russky crap.
If you decide to go to a non folding stock, probably the best and lightest stocks are the Ruger factory synthetic and the Choate. Choate also makes a nice handguard that has a lot of ventilation.