I guess I just never looked into a .22 conversion kit for any of my ARs. I did buy a .22lr Advantage Arms conversion upper for the Glock 19. That's really fun to plink with. As for rifles, my Ruger American Rimfire bolt gun and the Ruger 10/22 carbine account for a lot of .22lr down range.

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Yea I had an Advantage Arms conversion upper for my G20 10mm a while back and I have another .22 rifle, but I might suggest you get one for your AR's.
They are just so much fun for such a small investment, especially the conversion units.

I see the CMMG conversion kits advertised frequently on various sites. It gets mixed reviews; some people swear by them and some are negative about the function. If you have a suggested brand, either post it here of send me a PM.

Edit: Here is the one I have seen most frequently on several sites:

CMMG Bravo 22LR AR-15 Conversion Kit 5.56/.223 to .22LR w/ 3-25 Round

Yea that's the kit I got only it came with two magazines for a little less money.

Not satisfied with the way the magazines lock the bolt back on the last round or the increased hassle of loading ammo, (really not that bad) I got a BETTER-MAG adapter that allows me to use the S&W M&P 15-22 magazines which I much prefer.
Also got a plug for the buffer tube. (not necessary)

Now Rambo here has 110 rounds loaded up to suppress the plastic bottle onslaught! 😎

ETA: After a few hiccups when first used, which I attribute to a break-in period, this kit is running 100% now.

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