They are likely pricing in what will likely be a short legal life and ass-tons of liability insurance. lol
If they outlaw these then they had better outlaw belt loops too.
The BATFE can be so arbitrary. If the price point came down and too many people picked up said stock, they might just reclassify it. LOL on the legal costs.
This stock is just a novelty really. Who is going to pay $350 for it when you can get 1000 rounds of ammo and boatload of valuable practice for that amount.