Cowitnessing questions

[lethal dose]

Check out the trijicon Tr24. Gorgeous glass.

[Failure2Stop]

I have shot with both absolute cowitness and lower 1/3 cowitness. My initial exposure was absolute cowitness due to the mounts at the time for the Trijicon Reflex and carry-handle goose-necks for Aimpoints (M68/Comp M!) were only setup for absolute cowitness. Once I started trying out lower 1/3 cowitness 1X optics I became intimately aware of how much faster one can be, how much cleaner the sigth picture is, how much easier it is to apply hold-offs without a front sight post blocking parts of the target, and how much more of the target can be seen without the FSP in the way.

I was initially dubious about a fixed rear sight, thinking that I would constantly have it in my field of view and have to try to peek over it while shooting. Not so. The rear sight blurs out and all you are really aware of is the dot and target with the FSP just lingering at the bottom of your sight picture.

I really only use a flip-up rear on guns with magnifiers, though they do remove the slight blur of the rear from the bottom of the FOV when looking through the optic and the body of the optic can be used as a hasty ghostring if the shooter still has line of sight through the center of the optic. There is an application for dedicated 100 meters and under guns to have absolute cowitness with a folded down rear sight, but it still won't do anything for an obscured/fouled optic.

A front sight in the upright position is a prerequisite for a fighting gun in my opinon. In the event of an optic failure or destruction it is one less thing to have to mess with before being able to effectively employ the weapon at anything other than contact distance. Further, the front of the gun gets hot, and trying to flip up a hot front sight while someone is trying to kill you is an unnecessary layer of stress that I prefer to avoid.

[benw315]

Thanks again everybody! And Melpat, I have seen that picture before, I was just curious if anybody had pics of a target maybe 50 yards away with cowitnessing. Failure, that is some very good information, thank you.

[kmrtnsn]

I say stick with the standard FSP. It's one less thing that won't break and you won't have to worry about. No screws to come loose, no mechanisms to wear out, it's just there.
I also advocate using a fixed rear sight for the same reasons, and using a lower third co-witness on your optic.
You get the best of both worlds, the ability to use your optic unobstructed, and the ability to still use your irons immediately.
Read the co-witnessing explanation sticky, it will help you understand.
I suggest using an Aimpoint over an EOTech, and I don't mean to step on anyone's toes, but I find EOTechs to be very "niche" optics. I'm still trying to figure out exactly what that niche is or exactly what the appeal is with EOTechs.

I suggest you take a look at the Military Morons torture test of the Vltor clamp on folding FSB.

http://www.militarymorons.com/weapon...s2.html#torque

As for your comments on the Eotech, I completely agree. I would love nothing more than to remove the 552 from my issued carbine and replace it with an M4S.

[Hmac]

but I find EOTechs to be very "niche" optics. I'm still trying to figure out exactly what that niche is or exactly what the appeal is with EOTechs.

I've only shot my buddy's M4s, don't own one, but I do have a T-1 on my SBR. I prefer the Eotechs for the reticle, which I find significantly better for quicker acquisition, better both-eyes-open, and quicker compensation for height-over-bore at 25 yards or less. Personal opinion.

[Thomas M-4]

I have shot with both absolute cowitness and lower 1/3 cowitness. My initial exposure was absolute cowitness due to the mounts at the time for the Trijicon Reflex and carry-handle goose-necks for Aimpoints (M68/Comp M!) were only setup for absolute cowitness. Once I started trying out lower 1/3 cowitness 1X optics I became intimately aware of how much faster one can be, how much cleaner the sigth picture is, how much easier it is to apply hold-offs without a front sight post blocking parts of the target, and how much more of the target can be seen without the FSP in the way.

I was initially dubious about a fixed rear sight, thinking that I would constantly have it in my field of view and have to try to peek over it while shooting. Not so. The rear sight blurs out and all you are really aware of is the dot and target with the FSP just lingering at the bottom of your sight picture.

I really only use a flip-up rear on guns with magnifiers, though they do remove the slight blur of the rear from the bottom of the FOV when looking through the optic and the body of the optic can be used as a hasty ghostring if the shooter still has line of sight through the center of the optic. There is an application for dedicated 100 meters and under guns to have absolute cowitness with a folded down rear sight, but it still won't do anything for an obscured/fouled optic.

A front sight in the upright position is a prerequisite for a fighting gun in my opinon. In the event of an optic failure or destruction it is one less thing to have to mess with before being able to effectively employ the weapon at anything other than contact distance. Further, the front of the gun gets hot, and trying to flip up a hot front sight while someone is trying to kill you is an unnecessary layer of stress that I prefer to avoid.

Couldn't have said it better.
My personal set up is Aimpoint with m-68 larue mount with larue fixed BUIS the rear sight is completely out of the field of view with the lower 1/3 set up. And you have INSTANT USE of your Iron back-up sights.

[benw315]

The only problem with a fixed rear BUIS is that I plan on adding a 3x magnifier so I can switch from shooting near to far easily. That is also the only thing I have worries about with the Aimpoint T-1. I love the optic but I'm worried that the 4 MOA dot with the magnifier may not work as well at 100 yards and past for me as I got lasik done to my eyes recently so I have some slight astigmatism

[Hmac]

I can promise you that the Aimpoint T-1 won't work well with a 3x magnifier, certainly not as well as it works with any Eotech. As it turns out, the difference between a 1 MOA dot and a 4 MOA dot is pretty significant.

[lethal dose]

The 2 m.o.a. aimpoints work quite well with magnification.

[Hmac]

The other thing I find occasionally annoying about the T-1 is that it sometimes gets some internal reflections under some lighting conditions, something I don't get on my Eotechs.