So it seems if i get a gas block with the upper rail I can use that for a front flip up sight, and that will or should line up with a rear flip up, correct? My plan is to use a red dot with back up flip sights.

 

Also, what the hell is a delta pack? it seems like an end cap of some sort? sorry for the noob questions, but everyone here has alway been so helpful!

 

Im attempting my 1st AR build here and want to go with a short barrel and fairly light weight. So that would be a 14.5 in w/ break on the end resulting in a 16in total lengh barrel.. thats all good right, as long as the total length is 16?

If it's a low profile gas block, you will need a front sight that fits properly - mine's a low profile gas block and I had to go with a gas block front sight.

 

This one in fact.

http://www.skdtac.com/Midwest-Industries-Flip-Up-Front-Sight-p/mid.101.htm

 

If you get a regular railed front sight, it will be too low.

So that would be a 14.5 in w/ break on the end resulting in a 16in total lengh barrel.. thats all good right, as long as the total length is 16?

Yep as long as whatever muzzle brake you use is long enough to make the OAL of the barrel 16"+, and its pinned and welded, your good to go.

Nick is correct... some flip up front sights can be the wrong size depending on what you buy and where they are mounted. Do your homework and buy a matching set so your red dot with cowitness with your irons.

 

A delta pack is snap ring that the handguards are mounted to. I fits over top of the barrel nut just in front of the receiver.

Thanks for the input. How exactly would i go about making sure the back up sights and red dot will co-witness? Also if i mount the flip up directly to a low profile block, it will line up with a sight on the rail?

If the sight is made for low profile gas blocks, it will line up with the rear sight on the rail. I use a Midwest Industries front flip with a magpul rear. As for co-witness - it depends on what red dot you have and the height of the mount.

If it's a low profile gas block, you will need a front sight that fits properly - mine's a low profile gas block and I had to go with a gas block front sight.

 

This one in fact.

http://www.skdtac.com/Midwest-Industries-Flip-Up-Front-Sight-p/mid.101.htm

 

If you get a regular railed front sight, it will be too low.

 

I'm a noob, too.

 

Is there a gas block built into this sight?

 

GAPP: Why do you want the red dot to cowitness if you can fold down the iron sights?

The gas block is on the upper itself. The Front flip that I have mounts on the low profile gas block and is a taller sight so that it lines up properly with the rear sight.

 

As for co-witness - that's really your preference. Some people prefer full co-witness, some people prefer lower 1/3 co-witnes, some people don't want it at all.

 

I like full co-witness as I keep my Vortex SPARC mounted on my AR all the time. However - if the battery runs out, I can flip up the sights and look through the center as I do normally.

The gas block is on the upper itself. The Front flip that I have mounts on the low profile gas block and is a taller sight so that it lines up properly with the rear sight.

 

As for co-witness - that's really your preference. Some people prefer full co-witness, some people prefer lower 1/3 co-witnes, some people don't want it at all.

 

I like full co-witness as I keep my Vortex SPARC mounted on my AR all the time. However - if the battery runs out, I can flip up the sights and look through the center as I do normally.

 

 

this is exactly what i want. full co-witness if needed...

 

thank you for the info!

 

Mind sharing a pic of your rifle?

 

also, how do you like that sight? I really like the compact Eotech that takes the CR123 batteries but its so damn expensive..