I have a Vltor Mur - 1A that I was going to use for a build. With the sad state of NY political BS and the parts shortage, I don't think I'm ever going to get to it. This is brand new and in the original sealed packaging. I've seen them recently selling on auction sites for over $450.
Vltor had a lawsuit against Magpul not long ago. It claimed that the Magpul ACS buttstock infringed on the patent of the Vltor modular stock design.
Looks like Vltor dropped the suit after and agreement was made with Magpul.
Vltor Drops Magpul Suit Soldier Systems