The FFs are good and light. The Bushnell TR-25 is also good and cheap, if you wait for them to go on sale. A range pal has a bunch of those with no problems so far.
I like the TRS-25 as well, if that is what you meant by "TR-25". Very good little red dot for the money. I've had the one on mine for probably 8 years now. Target aqcuisition is very fast and it holds nice tight groups. It is easy to adjust and stays zeroed. I also like the small dot, as compared to other red dots, for more precise work. I'd love to try one of the Burris red dot's like the FFII or FFIII, but will continue to use the TRS-25, until it goes belly up..