Which ADM mount puts the Vortex Sparc at 1/3 cowitness?

[Mr. Meeseeks]

As the title says, which ADM mount puts the Vortex Sparc at 1/3 cowitness?

I've been researching this subject for a few days now and still haven't found a definitive answer. I just emailed Vortex before starting this thread, but I think they'll be out for the Memorial Day weekend.

BTW, I'm well aware that the LaRue LT-660HK combined with the thin shim provided with the Sparc will place the optic @ 1/3, but I'd like to maybe save a few bucks before I go the LaRue route. I have LaRue mounts for my 556 ARs, but the Sparc is going to go on my M&P 15/22 and I feel the LaRue mount may just be a little overkill for a rimfire rifle, specially when considering price.

If anyone has found the right ADM Sparc combo please share your insight, I'm sure I'm not the only one who will appreciate it.

[UserM4]

Are you absolutely sure that you want to go 1/3? Personally, a consistent cheek weld is a must for training.

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[Mr. Meeseeks]

I like the 1/3 for the more heads up cheek weld. I have my 2 ARs already set up this way.

I understand the value of training with the same cheek weld for both irons and optics, however, for now, I'm really just a recreational shooter and have no immediate plans to take a carbine class or undergo any serious tactical training. The 1/3 co-witness provides me a more comfortable cheek weld when wearing ear muffs/protection and shooting glasses.

I'm really leaning toward just springing for the LaRue LT-660hk so I'll have the ability to try out both absolute or 1/3 with the Sparc's thin shim. After thinking about it, the LaRue is only more expensive by 1 quality extra large pizza any how

[Mr. Meeseeks]

I emailed Marshal at Primary Arms with this question and here's what he wrote back:

The Sparc sits a little higher than a Aimpoint as well. so we recommend the absolute cowitness mount. That gives you a good sight picture when you are using your irons.

Marshall

Marshall Lerner
CEO
Primary Arms, LLC


I actually decided to go with the LaRue LT-660HK, but I figured someone else will eventually google for an answer to this same question...

Some observations on the LT-660HK:
If used with the thin shim supplied with the Sparc, the LT-660HK puts the optic at a slightly lower position than the stock Sparc mount. I like it much better. With the Vortex mount the front sight was at a very low 1/3, maybe even 1/4 cowitness. The front sight post is now where I like it on my other ARs with LaRue Mounts.

I haven't tried mounting without the shim yet to check out an absolute cowitness set up and after zeroing the optic, I'm not sure I ever will, I'm very pleased with where its at.