I have a hankering to make one of my AR15 lowers folding. What is your experience with the LAW Industries adapter (https://www.lawtactical.com/ar_folding_stock_adapter_gen_3_m_p/99312.htm)? Are there other decent alternatives? I'm reading about the MDT and DoubleStar folding adaptors but I'm confused as to whether they actually work with a buffer tube AR. And KRISS has a folding adaptor but I believe it only works with the KRISS Vector stocks. I understand none of this will allow more than single shot firing without unfolding the stock. Also, if I make an existing pistol AR lower folding, leaving a buffer tube or with a legal brace as the rear part, does the combination break any ATF rules?