I believe if one is wanting to attach a MRD to their pistol they start first and foremost with a GOOD reliable and affordable pistol. CZ have numerous models to cater for all needs. Sig i once thought made good pistols but, yes some models no other model. Made in Germany or other. The best sig is way overpriced. I have 3 red dots on my pistols, XD, Shadow 1 and shadow 2. Love the Vortex series both viper and venom.Nice article on the Sig.
About halfway down is a link for an XD-M w/red dot.
Sig Sauer P226 RX Elite SAO 9mm with Mini Red Dot [FIREARM REVIEW] - USA Carry