The gun has to fit in a 16"x14"x3.5" space.
The Cry Havok device allows them to do that with a decent barrrel length and four 30 round magazines in a carbine configuration that will be familiar to most users, and in a common caliber.
The Law Tactical folder and/or just popping the pins on a upper/lower will not work with the same barrel length and still fit in the space required.
I don't see a problem with this, if it has been thoroughly tested, and I assume it has been.
I think it is a good example of thinking outside the box to fit inside the box.