I don't have experience with the Steiner but have heard nothing but raves about it. Personally, and I know it's old school, but if I were in your spot I'd go with a Trijicon 1-4x Accupoint for the light weight, plus the ruggedness. You won't need more than a 4x for the 75-ish yards a PCC is going to shoot. Having said that... I do have to agree that a red dot is more in line with PCC uses. The CMore RTS2 is the best you'll find for competition (I like a 6moa on my PCC but 8moa is good too, which I use on my competition Steel Challenge rimfires). I use an RMR Type 2 for zombie purposes with my PCCI, finding it slower than the RTS2 but rugged as hell and the battery life plus the light sensing auto adjustment feature makes it unbeatable for HD in my humble opinion.