[Retrofitted]

Looks like it’s one of these:

http://bullets4life.org/bulletprove-accessories

The tl;dr version of the site is summed up here well enough.

https://cbs12.com/news/local/donate-a-bullet-save-a-life-mom-turns-bullets-into-jewelry-to-help-end-gun-violence

[Brown Deer]

see post 54.