Good evening to you!! The Kel-tec Sub 2000 is not banned in Maryland.
Kel-Tec Kel-Tec sub 2000 Not Banned Not Regulated by Statute 10/1/2013
Not cosmetically similar to an enumerated firearm & not a copycat weapon.
Bud's will ship without 20rd magazines
Have a good rest of your day.

Hi Jordan and welcome. Yes, Buds would ship without the non-compliant 20rd magazine. You would need to acquire 10rd magazines separately. Cheers, stay safe and enjoy!

Good to go in Maryland. This is what I found on the MD State Trooper Gun roster site:
Kel-Tec Kel-Tec sub 2000
Not Banned
Not Regulated by Statute