Red dots......I had one of the old SinglePoint ones on a Mercury for ratting donkeys' years ago and, yes, it was effective at close range, Nick.
In about 2009 I fitted one of the Hawke ones (can't remember the exact model name, but it was the cheapest one they did back then) and wasn't particularly enamoured.
I got a Walther one a few years ago. Again, can't remember the exact model name, maybe the Competition Pro? It's sat atop a mini-carbined 2240. It's okay, BUT, I've been thinking for ages about whipping it off and re-fitting the scope. Personally, for short range duties, I think I'd rather stick with a lovely, trusty 2-7x32 sxope on a rifle, with the mag wound right down to give quick target acquisition. And even that little 1.5-5x32 Simmons that sits on the little 30S I bought from you years ago is a nice little scope.
And opens on a pistol for me; sorry.
Just personal choice, obviously.