Some police chiefs who are political appointees anti gun can phuck with your app. They have in the past. Refused to sign off and even called the ATF and delayed. Again in the past and why its sherrif only.
Its probably different now that it is notify only but I still would only send it to county sherriff's.
They are the chief LEO in the county. Technically anyways. And answer to the people thru the election.
Do as you wish.
Never heard of any problems since notify only.
OP was not asking about send to his local chief, it was about sending it to MCaw.
I used to send them to Dallas Sheriff Lupe, she was so stupid she sent them back saying she does not sign them (after it was notify only). I then sent them to the trash as notify was completed.