Flat top AR

[TNFF319]

Dumb question

Will a front sight interfere with optics I mount? I like this upper but I am afraid the front sight will get in the way. Btw, I'm not sure what kind of optic I am going to get.

DPMS AR-15 A3 Flattop Upper Assembly 5.56x45mm NATO 1 in 9" Twist 16" Barrel Chrome Moly Matte with GlacierGuard Handguard, Front Sight, Flash Hider, Pre-Ban - MidwayUSA

[Sandman]

Yes and no. To have an accurate AR you need to sight in the iron sights first. Once sighted, then you sight in the optic using the front sight. I have an eotech with a flip up back sight and I sighted her in last week. You want the holograph barely floating above the front sight. Almost like a lollipop. But it needs to be sighted in to irons before you do the optic. I'm sure everyone will have different opinions, but this is the way the air force does it. Hope this helps.

[TNFF319]

Ok, thanks. I was planing on buying a flip up rear sight.

[Warbird]

No it will not interfere and there are a couple of choices to handle it. First no matter what you need iron sights. You can mount a folding rear and have a standard co-witness which means the iron sights and the optic basically see the same line of sight. Most people who use a EOTech use this set-up. The irons sights should be sighted in first. The optic sighted in independently after.

The second option is what is called a 1/3 co-witness, which means the iron sights can be seen through the bottom third of the optic when irons are needed. Otherwise the red dot is the primary source of aiming. Many who use Aimpoints set their rig up this way. Naturally 1/3 cowitness is accomplished with the use of risers.

This can be used with fixed or flip up sights. Again irons should always be sighted in first and then optics second independently. Especially with 1/3 co-witness the relationship between the front sight and the red dot being zeroed may or may not have any relation.

[gotigers]

as already said, No.

With red dots the sight should cowitness. I have a fixed front sight and rear pop up with an eotech. If my eotech goes out, buis is always up, so i am good to go. I dont even notice the sights.

With scopes 4x or over, the scope will focus past the FSB. Usually aa scope will set over the rear flip up when the rear buis is not deployed.

Many operators like a FSB. Some flip ups sights are not as reliable as the FSB.

check out ar15.com. you'll see that it isn't an issue for many.

[Auburn]

Its surprising how quickly the front sight simply disappears when you start shooting. You would think it would get in the way of optics, but it really doesn't.