If you limit your shots to 100 yards or less using the red dot scope, there are a lot chamberings you could use. I prefer a 10 inch barrel at closer range. They are so much handier than the 14 inch barrels. A 30-30 works fairly well out of a 10 inch barrel with factory ammo at 100 yards or less...
I would guess that DHS probably has 75,000 or so armed employees and that is not counting the Coast Guard. Most qualify 4 times a year probably shooting 100 rounds each per qualification. That's 30 million rounds a year at least for just one Department. I could see them purchasing several year's...
Reverse that. Pistol frame to rifle okay. Rifle frame to pistol not okay. Other laws still apply. For instance, you cannot put together a rifle with a barrel length less than the required length by law (16 inches I think).
TC won a case just a few years ago and they will tell you that you...