Thoughts on see-through scope mounts and AR-15 Carry-Handle mount scope mounting.
I will admit to being an accuracy freak. While some organizations like the Revolutionary War Veterans Association advocate 4 MOA (Minute of Angel) being acceptable accuracy I strive for half of that with my battle rifles and go for sub-MOA performance from my precision rifles. One of the key components for accuracy with a precision rifle is a good and consistent cheek-weld. This is aided by mounting the scope as close to the bore as possible. I can illustrate this for you by showing how the scope is mounted on my Remington 700 PSS below.
As you can see the scope rides comfortably on the stock which along with allowing for a more solid and consistent positioning from shot to shot actually aids in recoil management as well.
Now let’s look at an AR-15 with a scope mounted on a flat-top (A4) style receiver.
As you can see the cheek is once again anchored firmly on the stock. Compare the above image to the one below of a scope mounted on an A.R.M.S. Mount using an A2 receiver.
Notice how instead of a cheek weld you have a jaw-line weld. Not easy to keep consistent, and on heavier recoiling rifles not at all comfortable.
Unless you are using zero magnification optics, like Aimpoint or EOTech where you can look through the iron sights and use the electronic one, you can’t have two sighting systems available at the same time and expect to maintain any level of reasonable accuracy. It is best to get accustomed to using one cheek position and sticking with it. This makes transitioning to other rifles a much easier task because you don’t have to re-learn how to get your eye on the sights when shouldering the rifle.