As Axenolith points out, the federal estate tax exemption is up to $5.45 million in 2016. But, Lash died last year, and it was $5.43 million in 2015.
According to one of the articles, he was engaged for 17 years -- if he had actually been married, he and his wife would have had a combined federal estate tax exemption that was exactly double the individual amount.
I don't know what tax California might assess on the estate -- someone else will have to provide that info.
The value of the firearms and ammo would have to be established. Lash's girlfriend has an attorney, and he has estimated the value of the firearms to be as high as $5 million. Other estimates are much lower.
But, it looks like there will be some claims that must be paid by the estate first. Lash was living with his girlfriend, and reportedly did a lot of damage to her condo. It will cost up to $300,000 to repair it.
He did have other assets: about a dozen vehicles, some of which were highly customized. But, any remainder of the estate will be highly diluted, as he has no will and a lot of family members are laying a claim.
One thing worth noting: no one seems to know where he got all his money. There's no evidence of illegal activity. But, he was in a "relationship" with multiple women, and at least one of them was supporting him. It may have been just a series of con jobs.