I'm moving from TN to CA and don't think my Keltec sub-2000 can go

[Wiley50]

It's the 40 cal Keltec Sub 2000 folding carbine that uses Glock magazines. I have 1 10 rd and 2 15 rd. magazines. but it doesn't have anything else not allowed except removable magazines.

I love it and it's perfect for my sailboat and extremely accurate to 50 yds (all 15 in the center black spot in the center of the target. At 100 yds, it's accurate enough when aiming at center body mass.

Is it legal to take it to CA.

Should I trade it for a glock 40 cal pistol before I go?

What do I do when I cross the border in a penski truck? Does it have to be registered just to possess it? All we have in TN in a sales slip.

Do I declare it at thje border , then they hold it until I get it registered?

What is the procedure?

Any Californicators in here?