There had been several threads running on XS big dot express sights and the P290RS. As XS has not gone to the trouble yet to see which sights work on the P290, several folks were left "wanting".
Well, not being long on patience (the only Patience I have known was a girl in high school), I ordered a pair of sights that were for the P239 9mm.
Well they work. At 15 yards they place shots exactly where you aim them.
XS Sights currently does not have them available, but Midway USA does (and for $9 cheaper than XS)
So for those folks who are looking for them, get the ones for the P239 9mm (for those who just have to know they are the #8 and #8 height, front and back) XS Product number SI-0003S-3
XS Express Sight Set Sig Sauer P239 Matte Tritium Big Dot Front