Sako, among others, produces rifles (Sako 100) where it is possible to switch the barrel so that cartridges of different caliber fitting the same action can be used with the same rifle. So the idea is pretty old. If the whole modular idea is ‘but a new action an barrel’, it translates to buy a new rifle and switch the old stock and trigger across them.
PS looking at the Sako 100 it looks like the bolt also needs switching. SO even for Sako it is a matter of ‘old stock, new action and barrel on top’. It does not seem that compelling, short of being legally married to the stock.
Sako, among others, produces rifles (Sako 100) where it is possible to switch the barrel so that cartridges of different caliber fitting the same action can be used with the same rifle. So the idea is pretty old. If the whole modular idea is ‘but a new action an barrel’, it translates to buy a new rifle and switch the old stock and trigger across them.
PS looking at the Sako 100 it looks like the bolt also needs switching. SO even for Sako it is a matter of ‘old stock, new action and barrel on top’. It does not seem that compelling, short of being legally married to the stock.