Hello. This is my first post here. I hope that I've put it in the correct forum. I've owned many firearms in the past. I particularly like shorter, lighter guns, but I also like accuracy. I could go the route of building and registering a AR short barrel, but that would cost about 1000 dollars after building and paying the tax for the SBR, considering it was even approved. I really want either a Glock or an MPA (mac clone). I like the size, accuracy, durability, and vast options for magazines and attachments. However, I do not like the lack of shoulder stock. So I want to find out how I can legally put one on a gun like these, and keep the cost down, while remaining legal. Is it legal to put a stock on either of these guns without registering an SBR? The glock seems to be the easiest to do this with. I am also wondering about the fore-end grip. That seems to have legal issues with a pistol, also. I know there's conversion kits, but for that price, I'm back looking at an SBR AR rifle. I don't understand why these laws exist to begin with. I understand concealment, but damn.