I got the CMMG 22LR AR Conversion Kit. It allows you to shoot 22LR ammo from an AR-15 that is chambered in .223/5.56. I got a chance to shoot it at the gun range using my Windham Weaponry MPC rifle.
To order on Brownells:
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darn it! Now I have t' get one. (good lookin' out, though. Definitely gonna save some $ now. )