Good eye. Yes, 30mm. It is an actual spent shell casing from an A-10 Thunderbolt / Warthog from Iraq / Afghanistan tours. I purchased from a U.S. veteran that crewed these beasts from a firearm forum I am also a member of. It is my favorite desk curio / paperwieght / conversation piece.30mm? To big to be a .50cal
AZ330FZL
God bless our troops!
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