Much like the Dutch, not all of the Swedes went home when the colony was abandoned. Historians like to make proclamations that sound very profound, but often erroneous. I can think of two others: that all of the indigenous Indians of Florida were wiped out by disease and the Seminole occupied the land at a much later date. Apparently not so and many Indian people there point out that if they were Seminole (Creek, Choctaw, etc.) they should be speaking one of those languages, or a variation. They speak a totally different language as it happens, and they claim to be Colusa. Could be!
The other is the story of the Shawanoes going to Canada after the disasterous conclusion to the War of 1812. Some did and others went west to Indian Territory, but others just hunkered down in the brakes of the Ohio River Valley and took up farming like their white neighbors. There had already been a considerable number of intermarriages which made it a lot easier. A friend's mother is from Ohio and is a descendent of those people.
Anyway, those Swedish rifles are pretty fine and it would be grand to find one. Sweden would probably want it back, though.
Dick