Nightforce has also has some quality ones for a lil cheaper. Get the tall ones if you plan on using flip up caps on the front...... and to be able to unscrew the sun shield. (ask me how I know)I have T3 TAC A1 in 6.5cm. I have a Kahles 624i x 56 to install on it. I am looking for 20MOA rings that are high enough for the 56mm bell to clear the full length rail. If you have done the same thing what quality rings did you use???