My Father's stainless Colt Officer's ACP - Yes, it's a stainless, series 80 Officer's model.
It had a local gunsmith's 'going through' not long after he bought it when I was a very young kid, and it was one of the only firearms in the house.
I was 6 years old and along with my Dad on a range trip where I'd gleefully chase brass from centerfire guns and make a lot of brass with his old stainless 10/22 - and I vividly remember watching a family friend shooting a magazine through that small, stainless .45 and thinking a bunch of "I can't wait until I'm a grown up" kind of thoughts, when my Dad loaded a single round into a 7-round Wilson Combat magazine, and asked me if I'd like to take a shot with it.
There was about 3/4 of a clay pigeon laying on a dirt berm at 10 yards or so. I carefully wrapped my hands around the pistol, tried to steady my shaking hands and line up the sights, and the gun recoiled way over my head and the clay pigeon jumped about 5 feet in the air off the berm - I'd hit about 5 inches low.
After that, I made as much .45 ACP brass as my Dad would let me, and I went home with sore hands and sore thumbs from loading that same Wilson magazine over and over again.
Every time I pick up that pistol, I feel an indescribable mix of nostalgia and gratitude toward my Dad for raising me the way he did.
The rifle that gives me the warm and fuzzies - a straight tie between my Dad's old 10/22 I did my best to wear out, and my Dad's HK91. He assures me that the HK91 will be the last rifle I inherit from him - and it's hard to blame him there!