My Optic - Finally Decided

[Scoby]

Wanted / needed ( bad eyesight) a optic for my MP15T and decided to go with the new EOTech XPS after reading mountains of theads. Found a good deal through this forum at BoTach and yeah I've read all the stories about the bad CS. But for saving $70 bucks I may put up with a little hassle if I have to. I've got my fingers crossed.

I've also read alot about co-witness here. I have a buddy that has a EOTech site with Troy flipup front and rear BUIS. I have the same BUIS. His setup is absolute and I like that.

My question is this...............If I decide later that I'd like to have the 3x magnification for the XPS and have it mounted on a QD / flip to the side mount, does this magnifier mount sit higher on the rail than the standard mount of the XPS? Would I have to have a shim for the XPS with this mount and no longer have the absolute cowitness?

Somebody help me out.

Scoby

[oalocke]

I run an Aimpoint 3x in a Larue LT649 tall behind an absolute co-witness XPS and it's no problem at all. I swap the magnifier back and forth between a second rifle with a high-mounted Aimpoint T-1. The spacing and offset on the 3x is very forgiving.

The only thing to worry about is rail space. The Eotech needs to be mounted as far forward as possible on the receiver, with the battery box hanging over the rail/handguard, and the magnifier mounted as far back as possible (butted right up against the BUIS) in order to have enough space for your fingers to operate the buttons on the back of the Eotech.

[Scoby]

oalocke.........Thanks for the reply.

When you say "as far back as possible (butted right up against the BUIS)" do you mean with the BUIS in the flipped up position? Or would that matter? If you have to go to BUIS, the magnifier would be flipped to the side or taken off altogether. Am I thinking about this right?

[The_War_Wagon]

I have Astigmatism, and because of that, I switched from EOTechs to the Trijicon RX30-23. Brightens & dims automatically, and the single dot is easier to pick up for me. I had a 557 on my POF, and the little dots started 'dancing' on me, and the 512 on my M&P15T was 'fuzzy.'

Sighted in my POF last week with no problems at all (other than the Timney trigger locking up - that's another story... ). I won another RX30-23 (for my S&W) on Gunbroker this week, which should be here NEXT week - I hope to hit the range Friday and check it out!

[Scoby]

TWW - I don't think astigmatism is my problem. I've had the chance to use a EOTech once and I never had any problem with one eye or with both eyes.

My problem with BUIS is when I'm shooting, because of my eyesight and bifocals, either the front sight post is in focus or the target is in focus. Never both. One reason I'm thinking magnification is because all my deer rifles are scoped (leupold) and a fuzzy sight picture is never a problem for me.

I still feel like I've rolled the dice a little with the EOTech........we'll see.

Thanks

Scoby

[Hound_va]

My problem with BUIS is when I'm shooting, because of my eyesight and bifocals, either the front sight post is in focus or the target is in focus. Never both. One reason I'm thinking magnification is because all my deer rifles are scoped (leupold) and a fuzzy sight picture is never a problem for me.

Scoby

A tip on using iron sights:

(2) Focus of the Eye. A proper firing position places the eye directly in line with the
center of the rear sight aperture. When the eye is focused on the front sight post, the natural
ability of the eye to center objects in a circle and to seek the point of greatest light (center of
the aperture) aid in providing correct sight alignment. For the average soldier firing at
combat-type targets, the natural ability of the eye can accurately align the sights. Therefore,
the firer can place the tip of the front sight post on the aiming point, but the eye must be
focused on the tip of the front sight post. This causes the target to appear blurry, while the
front sight post is seen clearly. Two reasons for focusing on the front sight post are:
(a) Only a minor aiming error should occur since the error reflects only as much as the
soldier fails to determine the target center. A greater aiming error can result if the front sight
post is blurry due to focusing on the target or other objects.
(b) Focusing on the tip of the front sight post aids the firer in maintaining proper sight
alignment (Figure 4-18).

The eye can only focus on one plane at a time. The rear sight is in one plane, the front sight is on another plane, and the target is in yet another plane. That's the way a human eyeball works, one sight plane at a time.

[ST911]

Wanted / needed ( bad eyesight) a optic for my MP15T and decided to go with the new EOTech XPS after reading mountains of theads. Found a good deal through this forum at BoTach and yeah I've read all the stories about the bad CS. But for saving $70 bucks I may put up with a little hassle if I have to. I've got my fingers crossed.

Starting off your journey in RDS optics with both Botach and Eotech? That's tempting fate.

[Outlander Systems]

Starting off your journey in RDS optics with both Botach and Eotech? That's tempting fate.

Thanks for getting tea up my nose.

[Scoby]

Hound va - All good info., thanks. I do know to focus on the front post and I can. But the target gets so fuzzy (my shooting with this rifle has been at 50 yds at a 6" orange dot) it looks almost twice as big as it is.

I'm starting to think that some of my problem using the BUIS is that I've been accustomed to shooting my scoped .308 where my target is clear and the crosshairs are clear as well. My one and only experience with the EOTech has led me to believe that the 1moa dot and the ability to sight with both eyes open will help me a bunch. I guess I'll see what works for me. Thank again for your input.

Skintop911 / Landlord - I knew someone would get a chuckle out of it. I have been know to tempt fate now and again and I'm sittin here hoping I don't get the shaft!

Scoby

[Hound_va]

Hound va - All good info., thanks. I do know to focus on the front post and I can. But the target gets so fuzzy (my shooting with this rifle has been at 50 yds at a 6" orange dot) it looks almost twice as big as it is.
Scoby

You're basically stating that you see the target just as individuals with perfect vision do. Either put the clearly focused front sight post center mass of the blurred target or utilize a 6 o'clock hold with the clearly focused front sight post at the 6 o'clock position of the blurred target. It's your desired result of seeing 3 different sight planes at once clearly that is incorrect. FM 3-22.9 is downloadable and is where that small excerpt was taken from. There is more info to go along with that excerpt on proper sight alignment / sight picture.

Properly focusing a scope puts the reticle in focus for your eye. This is done against a blank wall or clear sky for a reason. You must still contend with slight parallax issues when things appear to be focused. Non-parallax adjustable scopes are set to be parallax free at a certain distance from the factory. Parallax adjustable scopes allow you to adjust the point at which the scope is parallax free. Hence part of the difference between non-parallax adjustable handgun, scout, shotgun, and riflescopes is the distance at which they are set to be parallax free.