Schaublin 150 lathe.
Deckel FP3 Milling machine.
Won the lottery lately?
Shaub 150's are running around $50k used, a fully loaded Deckel will spend a good deal of your grandkids inheritance. Not including any CNC options.
But you sure won't be limited by the machines!
>edit> Well, not much, anyway....
Every machine will limit you in one way or another.
Part of the game is knowing how to work around those limitations.
Pretty much any 13 x 40 lathe, and any Bridgeport style milling machine will do all the things required, if you learn how to use them. Top speeds are good, but a slow bottom speed is more important, for threading and chambering type work. A bore large enough to get a barrel, or possibly a complete action throughis nice.
Look at the specs of the Grizzly "Gunsmith" Lathes. Should give you a good idea of what works for some folks.
The Bridgeport style mill is not the last word in rigidity, but will do what has to be done, and is a pretty versatile piece of kit, and affordable. Tooling will cost you more than the milling machine, eventually, factor it into the budget.
Smaller machines will do a lot of good work, cost less, too. Depends on a bunch of other stuff.
How much money you want to spend? New or used? Space constraints?
Cheers
Trev