The main reason I got the ATi M4-22 was because here in MD, right now, or as of October 2013, you can only purchase a heavy barrel AR15 in 223/5.56. Hbar, as well as other caliber ARs, like 7.62x39 and 6.5 are exempt. In 2018 there was an attempt to remove the Hbar exemption making all ARs banned. My goal was to have this, since .22s here, as well as Canada, the UK, are exempt from the heavy restrictions of regular centerfire guns. As it was purchased as a polymer .22lr rifle, would be hopefully exempted if their attempt passed. But, if it did, since I have other upper, it could be reconfigured in an emergency situation, but mainly stay rimfire the rest of the time. Can't say I would depend on this POS though. But, I have other options now. Seems the dems in this state are going to reach for the moon after the next governor.