Imagine a shooting device so horrifying that the Trump administration wanted it banned. You know who doesn’t? The pro-gun right, which sued the ATF over its Trump-era ruling. Now it’s over to the Supreme Court. McKay Coppins joins to discuss.  » Subscribe to MSNBC: youtube.com/msnbc Follow MSNBC Show Blogs MaddowBlog: msnbc.com/maddowblog ReidOut Blog: msnbc.com/reidoutblog MSNBC delivers breaking news, in-depth analysis of politics headlines, as well as commentary and informed perspectives. Find video clips and segments from The Rachel Maddow Show, Morning Joe, The Beat with Ari Melber, Deadline: White House, The ReidOut, All In, Last Word, 11th Hour, and Alex Wagner who brings her breadth of reporting experience to MSNBC primetime. Watch “Alex Wagner Tonight” Tuesday through Friday at 9pm Eastern. Connect with MSNBC Online Visit msnbc.com: msnbc.com Subscribe to the MSNBC Daily Newsletter: link.msnbc.com/join/5ck/msnbc...