Stopped a Hollowpoint .380
Significantly slowed down a .45 fmj
Stopped a 12 gauge wax slug
Slowed down a 12 gauge 1oz Deer slug.
Damage to the TV behind the gummy bear was minimal till the Slug, and still it was only superficial. I bet it is a survivable wound.
Invest in 5 pound gummy bears instead of Kevlar.
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The weight would add up quite quickly though. It would be like the knights of the medieval ages, except more delicious