[mingaa]

The gun previously had a red dot and sights that co-witnessed through that with a gas block sight in the front. I added the scope and as I had sights I bought 2 identical 45 degree rail mounts assuming the geometry would follow as the front and rear change were identical. Apparently my low scores in math have payed off as the sights do not align and do not have enough adjustment to align. The pic attached shows the setup - it is not a sightline picture but you will see the rear is adjusted right as far as possible. Using a bore sight I have a pretty good idea where they need to be. I'm sure that I'm not the first guy to make this assumption so I posted looking for possible solutions. If there are sight sets made for this application (gas block front at 45 degrees) I'm interested. I can also change out the gas block for a rail height and get a new front sight if that's the answer.





NOT a sightline shot but look at the rear - I'm out of adjustment and the front is as low as it will go and that is not low enough either

[ColdBlooded]

Are you sure the gas block rail is the same height as the receiver?

[mingaa]

No the gas block is lower than the main rail and the sight set on it was made for that configuration. It worked perfectly when mounted straight up. I bought two identical 45 degree mounts and set that up but the geometry did not follow. Using a bore sight I see that I cannot get to alignment having maxed out front AND rear adjustment.


Previous setup - same sights.

[WoodenPlank]

I can't see the images from where I am posting.

I assume you are using generic 45 degree offset picatinny adapters with sights that were made to be mounted on standard rails. This configuration will NOT work correctly when dealing with a front rail that is not the same height as the upper receiver rail, regardless of what front sight you use.

You will have to change out the gas block to one that has a rail at the same height as the upper reciever rail, and you will need either a different front sight, or a set of fixed offset sights.

Edit: Ok, home now, and I can see the photos. No way is that going to work, unless you change the gas block to a same-height one.

[Matthew Courtney]

Originally Posted by WoodenPlank

I can't see the images from where I am posting.

I assume you are using generic 45 degree offset picatinny adapters with sights that were made to be mounted on standard rails. This configuration will NOT work correctly when dealing with a front rail that is not the same height as the upper receiver rail, regardless of what front sight you use.

You will have to change out the gas block to one that has a rail at the same height as the upper reciever rail, and you will need either a different front sight, or a set of fixed offset sights.

Edit: Ok, home now, and I can see the photos. No way is that going to work, unless you change the gas block to a same-height one.

Plank, I am a little out of my milieu here, but wouldn't a riser on the gas block that was the same height as the upper reciever rail give him a platform that would work?

[WoodenPlank]

Originally Posted by Matthew Courtney

Plank, I am a little out of my milieu here, but wouldn't a riser on the gas block that was the same height as the upper reciever rail give him a platform that would work?

If you could find one, I'm sure it would - assuming it was the correct height. However, I have never seen a riser specifically listed as being meant to act as a spacer for an iron sight like that, though. I'm not sure what actual height riser would be needed, either.

[Travclem]

Originally Posted by WoodenPlank

I can't see the images from where I am posting.

I assume you are using generic 45 degree offset picatinny adapters with sights that were made to be mounted on standard rails. This configuration will NOT work correctly when dealing with a front rail that is not the same height as the upper receiver rail, regardless of what front sight you use.

You will have to change out the gas block to one that has a rail at the same height as the upper reciever rail, and you will need either a different front sight, or a set of fixed offset sights.

Edit: Ok, home now, and I can see the photos. No way is that going to work, unless you change the gas block to a same-height one.

Probably going to need a new front sight too. The gas block front sights are taller to make up for the shorter rail. When you raise the gas block and put 45s on you'll need a front sight that is the same height as the rear sight. (rail mound front sight)



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[WoodenPlank]

Originally Posted by Travclem

Probably going to need a new front sight too. The gas block front sights are taller to make up for the shorter rail. When you raise the gas block and put 45s on you'll need a front sight that is the same height as the rear sight. (rail mound front sight)



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I said that, actually...

Originally Posted by WoodenPlank

I can't see the images from where I am posting.

I assume you are using generic 45 degree offset picatinny adapters with sights that were made to be mounted on standard rails. This configuration will NOT work correctly when dealing with a front rail that is not the same height as the upper receiver rail, regardless of what front sight you use.

You will have to change out the gas block to one that has a rail at the same height as the upper reciever rail, and you will need either a different front sight, or a set of fixed offset sights.

Edit: Ok, home now, and I can see the photos. No way is that going to work, unless you change the gas block to a same-height one.

[Travclem]

Originally Posted by WoodenPlank

I said that, actually...

My bad, it's been a rough morning.


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[Gunnut 45/454]

I get a laugh out of some of the setups I see. Dedicate it as a scoped rifle ! Forget the irons! Or get QD scope mount and put the irons where they need to be!

[WoodenPlank]

Originally Posted by Travclem

My bad, it's been a rough morning.


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No big deal, just had to give ya a hard time for it.

Originally Posted by Gunnut 45/454

I get a laugh out of some of the setups I see. Dedicate it as a scoped rifle ! Forget the irons! Or get QD scope mount and put the irons where they need to be!

Even more interesting that it's on a DPMS Sportical and using YHM sights...

Somewhere, brand elitists are crapping themselves.

[Foxtrotx1]

now that is interesting.

[surf]

I think the "purists" were perhaps too busy chuckling over the original issue with the sights not lining up to really care about any quality of rifle / parts topic.

For the OP, if you are insisting on an offset set up, nothing wrong with that IMO, you might as well go ahead and purchase an inexpensive red dot optic instead of using irons.

[mvician]

You took this - and this _ and turned them 45*. They won't line up. The 45* mount sits lower on the gasblock than the taller sight did.

[infidel66687]

red dot is the answer