Plus one on the Forward Controls Design mount. My RMR is very tight in mine. And I like the fact that it is steel. Attached photo.
As far as the SRO vs RMR? I have both. The RMR is undoubtedly the king as far as rugged/durable. But IMO thats for extreme situations. The SRO is no slouch but I could see the glass getting broke easier than the RMR. That said, I find the SRO way easier to shoot faster. I really like the clearer glass of the SRO over the RMR. My nightstand gun and competition gun are one in the same and I use the SRO. Carry the RMR mainly because of it’s size.
I wish Trijicon would come out with a RMR with a slightly larger and clearer glass.
My 2 cents.