Lend a gun????
My grandfather kept two axes ... one for his personal use, and one for lending!
I like your grandfather!
About 10 years ago I was at a Jeep parts swap meet. A guy on the far side had a sledgehammer. It was priced at $7, but he came down to $3 real fast, so I bought it. Completely tuckered me out hauling it back to my booth. It was a dainty little 30#er. I had a place for it, right next to my 20#er. My never used 12# and my often used 6# hammer were kind of hidden on the other side of the garage!
One day about 6 or 7 years ago my much hated neighbor, a lawyer of sorts, knocked at my door. He wanted to know if I had a sledgehammer he could borrow to put up his for sale sign.

Sure. So we went out to the garage, right in the front, and I handed him the 30#. He said he'd be right back with it. Mmmmm OK. So I watched him for a couple of minutes, enjoying his suffering. Sure enough, back up the street he came. He had more character than I'd given him credit for having. He admitted it was too heavy and wanted to borrow a lighter one.
I had just the thing, my 20#er. He hefted it, commented it was much lighter, and walked down the road. Yep, like clockwork, back he came. It was too much, too. So I offered to go down and drive the steel stake in the ground for him. Stopping in my garage I picked up my favorite, the 6#. A few good whacks and it was buried.
Of course I was 2 doors away with 56# of steel to haul home. No, he didn't offer to help so I did it in 2 trips. But he was sore for a while.

I wasn't!
Keeping loaner tools will protect your good ones. Being evil at heart will allow you to abuse the ignorant without them knowing it. Most people don't understand why anyone would buy or keep a 30# sledge. The answer is simple, for others to borrow.