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5/31/2008 9:37:17 PM EDT
Will a flat top ar with a fixed front sight get in the way of the view of the scope.  
5/31/2008 9:44:59 PM EDT
[#1]
You won't see the fsb on any power above 4.  Even at 4 it won't (shouldn't) be a problem.
5/31/2008 9:56:04 PM EDT
[#2]
The answer is "it depends".

What scope do you use? How close is the objective to the front sight? In many instances the front sight DOES interfere by:

- Blocking some light (makes image darker)
- Being visible as a blur in your scope image (usually when objective is close, e.g. within a focal length or two)
- Being visible clearly (in a lower power scope, such as a 1X red dot or 1.25x or 2.5x scout scope).

For this reason, AR shooters have developed a number of work-arounds if problems arise, including:

- Replace the fixed front sight with a folding front sight.
- Use a 45 degree offset mount (usually 45 degree offset picatinny rail risers. you attach the scope rings to the offsets. If you do this I suggest you offset to the left, if you are using a conventional right-hand AR)
- High mounting the scope so it "peeks" over the top of the front sight tower.

If you are planning to mount a high power scope, you should consider one of the options above if you find the optical performance is degraded, or if the operational use you will put the rifle to, would benefit from one of the work-arounds.



5/31/2008 10:03:55 PM EDT
[#3]
thanks.  Buddy o mine is building first ar pretty half assedly *if thats even a word.  It will probably be a 3x9 scope with rings from an old deer rifle if I know him.  I think Ill let him figure it out on his own.
6/1/2008 8:17:19 AM EDT
[#4]
Rings from an old deer rifle will likely be too short anyway.
6/1/2008 8:44:38 AM EDT
[#5]

Quoted:
Rings from an old deer rifle will likely be too short anyway.


...unless you offset

YHM 45 Degree Offsets

6/1/2008 10:56:45 AM EDT
[#6]
My Aimpoint Comp M co-witnesses with the fixed front sight and a similar removable rear sight.  

If you look through the rear sight at the front sight with the scope on, the red dot "sits" on the front sight post "dot".  This works really well when using front & rear tritium gas night sights.  The only concern is you lose the lower view below the red dot because of the base (which you lose anyway with iron sights - > easier to adjust to).  

You don't have to use the iron sights with the zero parallax red dot but if the red dot fails (assuming you haven't broken a lens) you can just use the iron sights "through the scope".
6/1/2008 11:10:22 AM EDT
[#7]

Quoted:

Quoted:
Rings from an old deer rifle will likely be too short anyway.


...unless you offset

YHM 45 Degree Offsets



Reminds me of BWS Homeboy NyTe SyTeS!
6/1/2008 11:48:58 AM EDT
[#8]
       I use the B-Square one piece mount which is medium to high ring equivalent. Even with smaller scopes (I have several of these mounts) I need this height to get the scope to line up correctly with my cheek mashed down to a A2 standard stock.
        With this setup I find even the lower power scopes where I can see the front sight
I am in a co whiteness situation where the center of the crosshair is at or above the top of the front post and I pretty much tune out the front sight.
        I would suggest your just mount up his scope and things will likely be good to go.
Second option is to just unscrew the front sight post and remove it and the spring and plunger from the front sight.
        The one piece mounts (there are several similar to the B-Square) give correct height and allow better flexibility in the front to back location of the scope compared to standard rings. Also allows alternate use of the clamp on irons and then return to scope with a fairly close zero
6/1/2008 2:55:36 PM EDT
[#9]
No "workaround" needed.  You just can't see the front sight base with anything from 4x on up.  It's just not visible.  No dark spot, nothing.
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