RE: Ruger 10/22 scope
You'll need a weaver T09 base so that you can use regular weaver style rings instead of weaker 3/8 tip-off grooved rings. Aluminum rings wll work ok. s to scope,EVERYBODY will have different opinion so here's mine-a 2x-7x or 3x-9x weaver rimfire scope. They are about the best scope for rimfires in their price range. I reccomend to spend at least as much on scope as you do for rifle. May I reccomend that you get a target model 10-22 instead of regular carbine? It's MUCH more accurate than the carbine and has heavy hammer forged barrel. Another way you can go is later as your money situation improves,build your own target rifle from carbine base as there's truckloads of aftermarket parts/upgrades available for 10-22.