I grew up in Minnesota and California. Both congregations I belonged to in those states had Witnesses who owned rifles/shotguns for hunting. My dad forbid firearms in our house, not because he is opposed to it, but my mother is. She has an unnatural fear of firearms.
I secretly owned an AK-47 and a SIG P220 handgun as a witness. Carrying of firearms to protect yourself is not forbidden - you just won't have extended privileges or hold position in the organization. That's why I did not become a cop while I was in. Huge mistake.
I learned in the police academy that Romans 13:1-7 is referred to as the "Police Officer" scripture by most churches. I learned that "Thou Shall Not Kill" is a mistranslated version of "Thou Shall Not Murder". There is a difference.
How can you be a minister of God and carry a sword he gives you to use against those who break the law while simultaneously go against scriptural principles?