Re: 50 BMG vs Concrete
They had a KABOOM (thought to not be the gun's problem but a reloading problem by the shooter) and the lawyers attacked. The company left California and re-appeared under a new name (sorry I don't remember the name???) in Nevada, I think it was. They showed up at a gun show there, as I remember it, in the last year.
So if you scope out the internet you may be able to find them under AR conversion or 50 BMG or ???
There is nothing wrong with our BOHICA although there have been many complaints by others who got earlier version. Ours was the last CA legal 50 CAL (50 DTC) as we had to plead with them to make one more in 50DTC and sign a waiver (leagally protecting them if anything happened which we gladly signed after spending a fortune getting a reloading setup for 50 DTC that would have to have been abandoned if we could not get a 50 DTC gun after the KABOOM in LA).