Satan works through men carrying guns.
Satan works through men carrying knives.
Satan works through men carrying clubs.
Satan works through men carrying rocks.
Satan works through men carrying hammers.
Satan works through men carrying screwdrivers.
Seems to me it's the intent for which we use our tools, not the tools themselves. I'm good with a simple shotgun, maybe a Taurus Judge pistol. I use them to bring food on to the table, protect myself from snakes; and will use them to protect livestock from coyotes, and my vegetables from rabbits and such. Boars are getting pretty proliferant in the area I'll eventually be moving to. And yes, if someone threatens my family, or even me, I'll most likely use them then, too.
20-something years ago, I joined the military to lay down my life, if necessary, for others.
If all that makes me less of a Christian in some folks' eyes, well, you're still welcome to come over and have coffee or tea any time. And if the situation arises that you're threatened while under the umbrella of my hospitality, I'll do what it takes--including laying down my own life--to protect you as best I can.