Why would Jesus need any firearm? 😎
Jesus' purpose was to die for sinners. If He had chose, He could have destroyed the universe with His words. I can only assume that carrying a weapon did not serve his purpose.
Throughout history, Christians have carried arms for a number of reasons. E.g., American revolution, civil war, world wars etc.
“All things are lawful unto me, but all things are not expedient: all things are lawful for me, but I will not be brought under the power of any.” 1 Cor 6:12
"And he said unto them, When I sent you without purse, and scrip, and shoes, lacked ye any thing? And they said, Nothing. Then said he unto them, But now, he that hath a purse, let him take it, and likewise his scrip: and he that hath no sword, let him sell his garment, and buy one." - Luke 22:35,36
"But if any provide not for his own, and specially for those of his own house, he hath denied the faith, and is worse than an infidel." 1 Tim 5:8