Originally Posted by ccase39
Looks like I would have to remove the front sight anyway if I took the carry handle off and mounted the optics as it looks like the front sight would obstruct the view of the scope. So I guess the only option I would have without removing the front sight, adding a low pro gas block and purchasing a new rear sight would be to mount the scope directly onto the carry handle. Would this be a good idea?
You could remove the carry handle, as you mentioned. And either an optical scope (3x9x40, etc) or even a red dot would work. The red dot would be focused on the tip of the post of your gun as it now sits. (If you also purchased a back up iron sight and viewed it straight on). there are many AR users out there that go this route.
You would think that the post will block out the view of your target, but by not having to look directly straight on into the scope, (this is what's great about holographic and red dot scopes) the red dot will 'float' above the post, and not block out your lower half of the target. Bad thing is some will cover over your target if the target is something like a can at long distances, so you have to lower the power on some of these scopes that have big reticles, so the reticle is not as bright, making the target visible.
If you bought some kind of a regular optic scope, then as mentioned by JJfuller, the scope being so close to the front post can't focus, and therefore 'ignores' the front post, or sees right through it. One of my AR's is set up like this, and the post does not interfere with the scopes field of view.
Here are 2 variations of what I am talking about
The top picture is still co-witnessing through the scope, but purposely set up higher so the back up sights are not the main focal point, but as a back-up only.