Takedown Rifles (1990s)

[Willy]

Originally Posted by Icelander

We want rifles that can be concealed on any fishing boat and in the normal luggage of tourists. As the rifles would be retrieved from the cache by covert operatives in a non-permissive environment years or even decades later, there is no guarantee that they'll have access to a custom-modified boat or other vehicle. They might rent or steal a boat and need to have weapons ready for quick deployment from the deck.

Ok that is another kind of problem. In the ealier times there were screw guns, litereally canomns mostly developed for use in the mountains, which had barrels! that were screwed together to make it easier to transport them on horseback. At least one modell was in serial production. That may be a possibility which would will exchange accuracy with range. Depending how precise you can make the thread.
There are actually no out of the box weapons of that kind.