Interesting. A bit over 20,000 people complete suicide by firearm in the U.S. per year (https://www.cdc.gov/nchs/fastats/suicide.htm). Where did FBI find over 50,000 annual bare-hands-or-feet deaths?
"Killed by someone" isn't "killed by yourself", so suicide isn't part of that. Also GP poster is referring to being murdered by someone using a RIFLE, not just someone using a firearm in general.