Internal, some also have bedding blocks which extend into a wrist pin style extension that runs down under the tang and into the wrist of the stock.

All Rem700s (even the cheap Sportsman 78 series!) in wooden stocks are pinned, as were many post 64 Winchesters from memory.

You don't have to be as obvious as external crossbolts ... some Vanguards also have an internal crossbolt epoxied behind the recoil lug.

There's more than one way to skin a cat!
Cheers...
Con