Quoted:
Quoted: Let's be honest though - the flat-top rail is a SUPERIOR mount for an optic. The CH mount might not be bad, but it isn't the best.
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And just why is it superior?
I leave "whats best" up to the owner of the weapon.
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Because the closer to the bore axis the sight axis is, the less parallax error you have, and the useful zero range of the optic will be greatly increased. The higher the optic is, the greater the difference between point-of-aim and point-of-impact as you change the distance to target. This vertical parallax makes precision shooting (in the vertical plane) much more difficult.
You also tend to cant the rifle more when the optics are mounted high, causing parallax in the horizontal plane as well.
Generally, optics mounted on an integrated flattop rail are much more secure than those mounted to an adapter that uses a screw though the carry handle.
Finally, and this is more geared towards magnified optics and iron sights than 1X optics, but a low mounted optic allows for a proper and consistant cheek weld (for most people). If you are one of those folks with big cheeks where the sights are too low, you can use one of many .5" riser rails to increase the height of the optics (though you're SOL for iron sights).
Despite being a believer in simplicity, I've come to the (reluctant) conclusion that flattops ARE superior anytime optics will be involved. Any honest weighing of the pros and cons will have the same conclusion.
-Troy