Threeband
The M1 Does My Talking
Call the Maryland State Police.
They are the best source for the answers to your questions.
...
Actually, I think the police are usually a bad source of information on the law. Whoever you talk to is probably not up on all the complexities, and is just as likely to have misconceptions as anybody else. You might's well ask the Produce Manager at Safeway about the gun laws. The average LEO is not a gun guy, not a lawyer.
The unspoken part is that if you attempt to move to Md on Oct 2 , there will be no possable way to legally bring your evil rifles at all.
I think if new residents can document ownership before October 1, 2013, their guns would still be grandfathered. So if somebody living in Ohio buys an AR this summer and is smart enough to keep the paperwork, he could move here in 2016 and bring his grandfathered AR. I know that was talked about during the sessions, though I'm not sure if it made it into the final bill.
There were a lot of vague promises of that sort made.
Anyway, the old law is still in effect until October 1, so for the OP it's true: registration is entirely voluntary. You don't have to do anything about registering your guns (except machine guns).
You might want to "voluntarily register" one handgun, though. If you're on record as a handgun owner before October 1, you won't have to take the non-existent 4 hour training class to buy another handgun.
Just stop by any State Police Barracks (it's a good idea to call first), leave the unloaded pistol in a case in the car trunk, and go inside and tell the nice Trooper at the desk you want to do a "Voluntary Registration." I think you still have to pay the $10 fee, and it's pay by check, no cash.
The main advantage is to avoid the training class. It does establish your ownership of the gun also, which might have some value. It's a good idea to keep your own records anyway.
Do stock up on soon-to-be-banned guns as a first priority. Handguns are second priority: you can still get them after Oct. 1 (but you'll have to be fingerprinted and buy a $50 license).
Might's well stock up on magazines over 20 rounds too, but that's just a matter of convenience. You can possess and use the larger mags, you just can't buy them here. As it is, we all go out of state to get 30 round magazines as it is, and that won't change, so don't worry too much about magazines.
Are you sure you want to move here?