any suggestions on a good conversion kit?
I have the CMMG kit that Wick posted and it runs like a top. It's not insanely accurate since the twist rate isn't set up for 22lr, but it allows you to shoot for cheap.
If you're a handloader, that first link is actually a really good price. Obviously if you don't handload, then buying 1000 pulled bullets won't help you unless you have a strong arm and can throw them 3000 fps
You also need to decide if you're comfortable running steel in your gun. Some people say it's harder on parts, and I would have to agree. But I also don't mind running it occasionally since it's so dirt cheap. Some ARs will be a bit picky and not run steel but most of them will as long as they are properly lubed.