The dot on the TR-24 is 3.6 MOA @ 1x and .9 MOA @ 4x. Aimpoint's T1 is a 4 MOA dot, Comp4 is 2 MOA. It is not as small as it looks in the pictures.
http://www.trijicon.com/pdfs/AccuPoint_Specs.pdf
Cool! I did not get the change in 1x to 4x. I thought it stayed the same 1moa no matter the power.
You are sorta correct. The dot size stays the same to your eye, its the target that changes sizes as you zoom in or out, thus making the dot look either smaller or larger compared to the target.
You are correct. Some more pics.
BTW, the scope is off the rifle.