Why do you want to use a RDS? Personally I would stay with irons, if I could: Nothing to fail, no batteries to replace, no extra cost, no extra bulk, no issues with astigmatism or colors, no delicate lens that needs to be protected and cleaned, no new learning curve. I use them because I can’t see the irons and the target at the same time. Once I started shooting RDS I wanted/needed all my guns to have them. It is just enough of a different shooting style, for me, that it’s one or the other. Switching between them slowes me down and impacts my accuracy. if my eye sight was good I wouldn’t switch. Now I have pistols that are basically obsolete unless I upgrade them. Really takes the shine off of buying a new pistol to.
I would say try them out first. Look at 2 vs 6 Moa dots vs combo reticle. If it’s about just speed then 6 moa works great. For fast and better accuracy use the combo reticle ( 65moa circle with 2 moa dot) If you are looking for bullseyes the 2 moa. If this is a range toy then I wouldn’t worry about back up irons. If not definitely get irons that cowitness. I had a battery cap that flew off, my fault but I would have bet money and potentially my life it was good to go. Had mount screws that were locktighted loosen up and lost my POA instantly ; one round on target the next completely off the target. Lost a mounting screw that Loosened up and just disappeared while shooting. I’m not saying I forgot to use locktight on it but will admit it’s a possibility. The other 3 stayed tight and I never lost zero so a win! Had a newish battery that drained down while shooting until I couldn’t see the dot in the daylight. Technically it didn’t fail, but not very useful. Don’t buy the cheap Amazon batteries.
