Assuming this is a CZ?
I would probably sell the whole thing, as is, with dies, bullets, whatever you have left...and build, or buy a 20 cal something based on a 221, 222, or 223 cartridge. I would even consider a 222 Mag based(204R)
This is assuming that you have to sell the 19, to get the job done. If you don't have to sell it...don't. My self centered self, loves going to the range and being asked..."whatch'a shootin' today?" 19 Badger. "A what?"....
I love that!
Larry