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[Full Metal Jacket] It is a movie, but as that has been covered I will give it's original meaning. FMJ is [Full metal jacket]. A bullet that has a copper (or some other metal) covering or "jacket" over its lead core. This is done so that the bullet has more [penetration] and won't pancake on impact. Note some bullets have no metal jacket. The standard .22 caliber is an example. A hollow point bullet has a hollow tip that makes it a highly lethal manstopper because it will pancake inside the body causing more damage to organs. Theese such bullets are outlawed by the Geneva Convention. *Note FMJ bullets are not the same as armor peircing bullets. Why on earth would any sane 13 yr old know this?
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