Good point. The rebuild kits were a loophole that they seem to be closing. The wooden dowel kind of is too. But popping the base plate off isn't that easy and requires some kind of tool so not really readily reversible. More like mostly kind of readily reversible.
Most FFLs have been doing this all along. Why is this a new thing? Are they just making sure everyone knows again? The FFL will either only accept 10 round mags to be shipped in, no mags, or they will block the mags that came with the gun. This how all of my dealing have been in MD, mostly...
Ok can we say "psycho"? Should have just offed itself. Now it's going to be in jail for a while, especially if its dad had a gun and it had the means to carry out the attack.