The sights from the limited are not for sale commercially,
i ended up with nodak spud sights they are far better than the Factory limited sights.
nds 26 and nds 40 this will co witness with small red dots such as the trs 25 and can be used with quick release rings or see thru rings
http://www.nodakspud.com/NDS-22.htm
I used quick detach weaver rings extra high they are the lowest you can get for this setup see thru rings would also work.
you can also change the windage drum on the side of the nodak rear sight from dpms for under $5
http://www.midwayusa.com/product/353544/dpms-rear-sight-base-rapidex-windage-knob-ar-15-a1-matte
If you look at this picture you can see the windage drum it makes it alot easier to adjust
The nds sights are compatible with different AR sight posts and sets
http://www.midwayusa.com/product/42...ght-set-ar-15-steel-matte-3-dot-tritium-green
That would be my first choice but there are 3 others to consider depending on price and what you would do with them. Also consider some kind of adjustable cheek riser if you are going to be using both scope and peep for sights.
something like this https://www.diproductsinc.com/Detail.aspx?PROD=1189961
williams ace in the hole (best price) i think you can get them direct from ruger also
http://www.rimfirecentral.com/forums/showthread.php?t=594884
http://shopruger.com/10_22-Ace-In-The-Hole-Set/productinfo/12938/
http://www.midwayusa.com/product/25...ith-picatinny-base-ruger-10-22-aluminum-black
tech sights (if you want a peep sight that is removable from a factory ruger rail)
http://www.tech-sights.com/
true shot (never used)
http://www.trueshottechnologies.com/ruger-1022-photos.html
Here we discussed some different options
http://www.rimfirecentral.com/forums/showthread.php?t=594729
and here is a different option
http://www.midwayusa.com/product/18...-deerfield-carbine-99-44?cm_vc=ProductFinding
Good luck on your adventure
