Irons, because I'm fairly religious about carrying the work gun off duty and we don't authorize RDS yet. Also, because even if I don't carry the work gun, I don't want to create a massive dissimilarity between guns I carry at work and off work, and training incongruities.
Id like us to have an RDS authorized, as in the last 2-3 years in particular my ability to focus on the front sight has become more difficult and it is noticeably impacting my 25 yard accuracy. we are currently evaluating RDSs and I'm fairly confident we are going to buy the ACRO P2, but it hasn't happened yet; word from senior management through the FTU is that "it's definitely coming", we just don't know when. After shooting @Kyle Reese's G19 w/ACRO P2 which turned shooting accurately at 25 into an exercise as simple as running a typewriter, I'd really rather get an RDS authorized at work sooner than later.