Red dots on small packing guns...

MY LGD has a XDS 9 Mod2 with the CT optic red dot. I'm not a big XD fan but they shoot fine. This one is used but I can't tell it, with box papers, all pieces and mags, for $500. Seems like a pretty good deal and it has my curiosity up. How much does the red dot extend the range of hit capability on the little gun? Would it make 50 yd. hits on a 6" gong "easy" compared to the 5" sight radius? I almost bought it just to see for myself. It's a nice package all put together.

I really went in to look at a little SP101 .22 8-shot he has with a 4" and green optic front sight. I already have a M63 Kit gun but this little Ruger has had my eye for a while. Then I passingly noted he had a nice old Colt Official Police 6" in .22 LR, 85% for $500 on the tag. He has some wiggle room usually on stuff like that. I thought the OP .22's commanded a premium over the .38's and .32's. It might be a deal too.

His mint SP is priced at $550.

This is a picture of one a bit nicer than 85%. I think it went at auction for a little under $800. Still a deal, it is actually the Python chassis in fixed sight form.