A lot of the appeal of guns for me is related to the appeal of trains, automobiles, and sailing ships - they are interesting machines with a huge historical importance, and with thousands of variations on the design over the years. I love reading about the various innovations made with firearms over the years and how they effected warfare and society in general.
There’s also the appeal of things that are fast, noisy, and destructive. I can’t think of anything else a normal civilian can purchase that allows you to control something moving at supersonic speeds. People also like making loud noises, note the popularity of firecrackers or blowing up a plastic bag and popping it loudly. And I also enjoy the practice and the concept of punching holes in things from a distance…when I got my first BB gun, just the idea I could point it at a can across the yard and punch a hole clear through it was cool. It’s incredibly fun to shoot stuff.
Then there’s the basic aesthetic appeal firearms have. A functional firearm has to be compact, reliable, and fit the human hand well - and over the centuries they have become so refined that modern firearms are almost universally elegant in appearance to me - simple but precise. I have something small enough to hold in my hand that, with only the power of my finger squeezing a trigger and the potential energy that transfers to springs, detonate a small explosive charge that moves a projectile down a perfectly-fitting tube, and with the same motion cycles the expended cartridge out of the way and places another in position for a second firing. It’s such an ingenious and clever device that the same basic design has been used for over 150 years, and revolvers are still considered more reliable and safe than semiautomatic weapons, which is why they are still in use. All this and pretty too.
Of course, there is also the feeling of power firearms give you, and the certain solemnity it inspires when someone familiar with them handles them. I know just how dangerous my gun is, and that enforces a kind of calm, cautious, and precise thinking when I am using it or maintaining it. I imagine the feeling one gets from properly performing Japanese tea rituals is the same I get from cleaning and loading my gun - it’s really quite peaceful. And the knowledge that I could take someones life with the squeeze of my index finger gives me an awareness of mortality and the power invested in all humans.