YOU SAID:

i need a gun to keep myself from harm

INTO JAPANESE

私は自分を害から守るために銃が必要です

BACK INTO ENGLISH

I need a gun to protect myself from harm

INTO JAPANESE

危害から身を守るために銃が必要です

BACK INTO ENGLISH

You need a gun to protect yourself from harm

INTO JAPANESE

あなたは危害から身を守るために銃が必要です

BACK INTO ENGLISH

You need a gun to protect yourself from harm