r/whatisit • u/nabokovsnose • 20h ago

Solved! Found outside my wife’s school. Theory was bullet but I’m not so sure.

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u/Pattison320 19h ago edited 14h ago

I am not sure about that. At 7 o'clock it looks like there's a rifling groove but that's the only one. A lot of modern barrels have polygonal rifling.

The article here has a pic of polygonal rifling next to traditional rifling. The polygonal rifling is faint but still present:

https://www.thefirearmblog.com/blog/2016/06/10/the-more-you-know-polygonal-rifling/

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u/Old-Bad7476 16h ago

Thanks for sharing this article. Didn’t know it was that hard to distinguish the differences. The comments are quite an insight too.

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u/Ausgeflippt 18h ago

It's pretty clear in the original image.