A mrad or millradian is 1/1000 of the distance no matter what , the difference between the usmc and army mrad scopes is the army scope mildots are round and the usmc mildots are more of a foot ball shape. I really don't get how they worked this out to be 3.438 (true mrad) as opposed to 3.375...
Any way 3.438 as SB runs a true 3.6" at 100yds