This is what I did. Go online, or to your local gun store, CMMG makes a 22lr conversion for 223/556 ar15 rifles. All it is, is the bolt group and a mag. You take your standard 223 bolt group out and slap in the 22lr bolt and boom. You have an ar that shoots 22lr and 223. It's perfect to save your 223 but still get the fun of shooting your ar. And the 22lr ammo is a lot cheaper than 223/556. Look on YouTube. CMMG 22lr conversion kit for ar15. It was a great investment for me. Some may disagree.