7.62mm bullet keychain
thingiverse
Went to the range, picked up a spent cartridge, brought it home, made a keychain. The 3D printed bullet is hand pressed into the cartridge and seems to stay in place just fine. You can always use a little glue to make sure it doesn't fall out. A 3/16" hole is drilled near the rim to accommodate a key ring, which also renders the cartridge completely non-functional.
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