Board Thread:Forum Games/@comment-30868172-20180116153103/@comment-34950117-20180116213122

Karen.celedestin wrote: Pretty sure it is. I've done research on it. It looks nearly identical to a Barrett 20mm and uses the same ammunition. Soon, though, I'll consult an expert or something.

I never heard a Barrett chambered in 20mm, but i know at one point they had a prototype chambered in 25x 59mm.

It would be a good ideal to bring it to a experienced gunsmith, they simply pour cerrosafe in the chamber, then they remove it and take a book with most modern caliber and tries to find the caliber.