I just measured the height of my TMX rib at 19 mm receiver and 16 mm muzzle for a 3 mm slope
this equates to .76" and .64"
by comparison my MX3 single barrel rib measures 10 mm @ receiver and 5 mm @ muzzle
for 5 mm slope and this equates to .40" and .20"
So the MX3 has a steeper slope to the rib, The POI is the same for both guns at about 9" high at 40 yards but I see more space between the beads with the TMX.