I was reading the SB281 FAQ today and I was curious about something. They've set all these regulations on AR15s, but lets say you build a complete upper with a barrel and flash hider that would be illegal under SB281. If in the state of maryland you never connect the upper to the lower would you be breaking the law? I was just curious what would prevent people from making uppers that they want, and connecting it to the lower once they arrived at the Fairfax NRA range, for example. The bill doesnt ban items, we just cant use it on the gun and the receiver is the gun legally. I know getting caught with a complete upper that would be illegal to attach to a lower might be difficult to explain, but technically speaking whats the legality of this?