Live in MA, as it says. I know a folding stocks, obviously, folds and is illegal in MA. I understand that it is certainly possible that a 'Collapsible' stock is also illegal. But what about an adjustable stock? There is a stock I want to buy (Specifically, the Tapco T6 Intrafuse) and it is adjustable, meaning that you can adjust the length to compensate for different sized shooters. Looking into it, though, Tapco call it a 'collapsible' stock on the packaging. Are those illegal in MA? It does NOT fold in half, it only has an adjustable length. Does this make it illegal?