To my understanding a sbr AR-15 with government profile barrel is legal in MD even though it is essentially a "copycat".
Auto Ordnance sells the semi-auto Thompson 1927 A-1 pistol (approved on the handgun roster) as well as a separate stock that would fit it once it is sbr'd.
If starting...
Getting ready to purchase a Manners t2 or t4. If anyone has one or a similar style and lives in the central maryland region I would really appreciate the opportunity to try it out. Please pm me or comment if your willing to help out a fellow member. Of course will supply ammo and have land to...