I had the TM tri rail and I'm now running the TM high cycle version, both are pretty amazing IMO. As mentioned the 170 mid caps are great, they sometimes need a bit of breaking in but once they are they work flawlessly, even with the 25-30 RPS the high cycle can kick out. I do have a couple of high caps which can be a bit problematic (randomly unwinding, a pain as the mag has to be removed to wind it) but a solution that works for me is to only fill them to about 80% capacity and they are a lot more reliable but I still prefer using the mid caps. One issue I initially had was that the high cycle sometimes double tapped or burst on semi caused by mucky trigger contacts but once they were thoroughly cleaned up it has worked without issue. I would highly recommend both the tri rail and high cycle, I've seen the red dot version but the red dot takes up the top rail space so switching it out could be a pain if you want to use a different optic, though it does look good. Some are put off by the stupid barrel extension the high cycle comes with but it can be removed, I personally got a classic P90 flash hider but you can use the one attached to the end of the barrel extension.
