AR Optics 1-8X 24mm, 30mm tube?

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Keep in mind that a scope with an objective diameter of 24 mm and a maximum magnification of 8X is going to have a very narrow 3 mm exit pupil at maximum zoom. There is no getting around this, it is physics. That means that at high magnification, your eye box will be very narrow and your shooting eye will need to be very precisely positioned to achieve a full field of view without vignetting. In dimmer light, the diameter of your pupil is going to be significantly greater than the exit pupil of the scope at 8X.
This is good to know, thanks. I've had lots of experience with many scopes and many calibers, but this is a first for me with an AR and short range rifle shooting (asssuming the coyotes I call come in close). I've called coyotes to within ten feet and have missed shots at very close range, like 25 yds, because I couldn't get the scope dialed back soon enough. It sometimes happens very quickly. At this point, this is experimental and I can always go back to longer traditional scopes. The rifle will be done this week!! I'll let you know.
 
Just to be really, really, clear, 1 Mil is *exactly* 3.599" at 100 yards.....and is rounded up to be 3.6".

But, who sweats small chit like that......right?

1 MRAD subtends 1/1000 of the distance to the target. At 100 yards, 1 MRAD = 100 yards / 1000 = 3.600 in. At 100 meters, 1 MRAD = 100 meters / 1000 = 10 cm.

A radian is the angular measure if you wrap one radius around the circumference (2 pi radians = 360 degrees). A milliradian is 1/1000 of a radian, or the angle if we travel 1/1000 of a radius around the circle. In this context, a radius is the distance to the target. If we really want to flog this horse, we'd recognize the 3.6 inches is wrapped around a circle with a 100 yard radius, and the true perpendicular height subtended is actually the tiniest smidgen over 3.6", or 100 yards * tan(0.001 rad) = 100 yards * 0.001000003333... = 3.6000012 inches.

I'm not sure where you got 3.599" from.
 
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