Quoted:
The CompM2, M3, M4 are 30mm tubes. The Micro T-1 is a 20mm tube. However, you will not notice a difference in the size, esp. if you shoot with both eyes open as you should.
Go to www.downrange.tv/show2 and watch video clips Part 2 and 3 to learn more.
S/F
In the 2nd vid, when they demonstrate the return to zero, isn't that more a function of the larue mount being used?
Granted, the M4 is a fine optic, but that seemed misleading. Or do the M4's that go to the .mil come with larue mounts?