http://mgaleg.maryland.gov/2013RS/bills/sb/sb0281f.pdf
This is the "gunsmith trap" - If your AR breaks after Oct 1 and you take it to a gunsmith for repair, the exchange of that AR to the gunsmith was not legally done. No background check was accomplished for that gunsmith to take possession of that banned firearm. Under this section of the law LE could
confiscate and destroy that weapon since the gunsmith is in illegal possession of a banned firearm.
Here's another little trap you may not know about... 'the hunting trap' - If you go hunting out of the state with your AR, and get caught trying to bring it back it, you are in violation section 4-303, and LE is required to
confiscate that LEGALLY OWNED firearm from you.