I have a Ruger 10/22 that I fitted with a fugly Choate pistol grip stock and XS Sight Systems ghost ring sights. I prefer it to a .22 LR AR conversion kit. It handles well and is amazingly accurate.
I have Aimpoint red dot optics on my M4s. When I want to use the 10/22 to work on my red dot skills I remove the ghost ring sight, install a Power Custom Weaver base, and then mount a cheap BSA red dot scope. The setup works very well for me. When I'm done training I re-install the ghost ring sight, which always installs perfectly zeroed without any adjustment. (btw I don't do this very often as I prefer iron sights to optics.)
I prefer a Butler Creek 10 rd magazine to the Ruger rotary magazine - the factory mag can't keep up with rapid fire after it becomes dirty. I've never had as much as a hiccup with a Butler Creek 10 rd mag. It functions as fast as I can press the trigger.
I also have a couple of Tactical Innovations 25 rd magazines that I found work best when loaded with about 20 rounds max. (The magazine is too sluggish for reliable rapid fire (double tap) operation when loaded with more than 20 rounds). As I said above, I prefer the Butler Creek 10 round magazines for the best reliability.
Finally I use a Butler Creek 10/22 magazine loader, which makes charging magazines a snap.
Good luck!