We probably all have one or more. Just curious about this. List rifle, shotgun, handgun/pistol and why. I'll start...
Handgun: Ruger Single Six 22lr. My 15th birthday present. Always works, always handy and has accounted for a ton or more of small game, snakes, and critters caught on the trapline.
Shotgun: Mossberg 500 12 ga. Old and beat up just like me. With a set of clip on Firesights I can keep 5 Foster style slugs in a 10" circle at 100 yards from its modified barrel. Shoots to point of aim with anything I put in it. Just fits right.
Rifle: Marlin 336 in 30WCF. Shortened the stock several years ago in preperation of my oldest boy's first deer hunt. Tip to tip it is 36" long. Light, handy and accurate with cast or jacketed.
You got some too?