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Discussion Starter #1
I bought an Sadlak Airborne mount for my M1A and after several times installing it using both the standard instructions, and "If you are having installation problems" instructions and conferring with the nice gentleman who offered support when I called Sadlak, my ACOG scope is still way off to the left, I do not have enough windage adjustment to bring it to zero.

I can only surmise that my receiver is so far out of spec that Sadlak has no solution. I have too much invested in the mount to abandon it just yet for another so I will attempt to shim between the ACOG scope and the Airborne mount to correct the windage offset.

Any other suggestions on how to get the Sadlak to function? I am feeling pretty disillusioned about getting my M1A scoped.
 

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Mick, call Sadlak and ask for Mike, he will tell you what has to be done. If he isn't available when you call, he will return your call. The service at Sadlak is top shelf.

Rich
 

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I used the Burris Signature rings with the offset pieces to correct my windage problem when using the ARMS 18 mount. Works great and the rings are steel and very beefy and should withstand the M14 firing forces.

But make sure the Sadlak is firmly and squarely mounted before trying the rings.

Ahh, WXL beat me to it!
 

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Discussion Starter #5 (Edited)
A couple of members suggested using Burris Signature rings, thanks for the input. The Trijicon ACOG scope has a picatinny mount that screws right onto the scope so it does not use any rings.
I did call the Sadlak support and got some suggestions but no solution. I emailed them my receiver Self-Inspection measurements last week but have not gotten a response, Sadlak did let me know that they are looking at it.


The reticle is way off to the left so I 'm planning to shim between the picatinny on the ACOG scope and the Sadlak mount on the front right to bring the reticle to the right.
 

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I doubt if it's the rifle, my guess is that the Trijicon mount is the problem.

If this were my optic then I'd shim between the side plate of the Trijicon mount and the main body that it screws in to. Any shimming is going to increase the chance of you having problems but especially if you shim between the Trijicon mount and the Sadlak rail. Any time you insert a shim you want it to fit between flat surfaces, any curved or shaped surface will increase the chance of the shim shifting under recoil forces.

Also, I hope you have accounted for the high optical axis of this setup, you are going to need a really high cheek. Note the really crappy cheek weld and the exceedingly high cheek rest in the photo below. These are not going to help your accuracy.


ACOG's are designed to be used with straight line stocks, not the older style drop comb style of stock. Also, notice how far back the shooter above is from the optic, it looks to me like he has more than 2.5" of eye relief and most ACOGs have 2" - 2.5" of eye relief with the exception of the 1.5x24 model which has 3.6". Hopefully the optic can sit far enough to the rear on the Sadlak rail.
 

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MickGIS, Did you send the inspection report to [email protected]? Would you mind sending me a PM with your email address so I can retreive it and go over the report with Mike Sadlak.

Mike and I just talked about your problem and he has a few suggestions but to get to a solution, we need to try to isolate the the source of the problem.

The first step is to determine if your mount is straight and flush against your receiver. To do this, remove the clip guide screw and clip guide key and tighten and torque down the Hex screw on the receiver left side. There should be a space between the dovetail and the angled face.

If you solve the windage issue with this step, that we know that there has been an installation issue. Mike thinks you may have lost the flush contact when going through the installation.

When we get the results of this step and go over your inspection report, it will be easier try to figure out what is going on.

Our apologies for the delay in responding to your inspection report but I'm sure we can get to the bottom of this and come up with a solution

Dee
Sadlak Industries
860-742-0227
 

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Discussion Starter #8
I doubt if it's the rifle, my guess is that the Trijicon mount is the problem.

If this were my optic then I'd shim between the side plate of the Trijicon mount and the main body that it screws in to...
Roger that, shim within the picatinny clamp itself. I knew about the ACOG being higher so I bought a Tac-Pro cheek riser to give me a bit more height for a better cheek weld.

Thanks.
 

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Let me know when you try that first test and we'll go from there. Your specs look to be within an acceptable tolerance so we'll start narrowing down the problem.
 

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Discussion Starter #11
Dee,

Thanks for the help. I am not confident that will solve the issue as I torque all the screws to specs ever time I install the mount. Heading to work now so I will remove the mount and reinstall torquing the screws to specs either later today or in the morning and report back the results.

Mick
 

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Remember to remove the clip guide key first then install the hex screw and cam washer only and tighten those without the clip guide key in the dovetail. We are trying to determine the relationship between the mount and the angled face and see if the mount is totally flush with the receiver left side. Do not adjust your TV folks, this is just a test.
 

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Discussion Starter #13 (Edited)
Remember to remove the clip guide key first then install the hex screw and cam washer only and tighten those without the clip guide key in the dovetail. We are trying to determine the relationship between the mount and the angled face and see if the mount is totally flush with the receiver left side. Do not adjust your TV folks, this is just a test.
  1. Removed the clip guide key completely and the Sadlak mount was in contact with the lower angled face of the clip guide with the hex bolt at torque.
  2. Loosened the hex bolt and backed off the cam washer till I was able to pass a piece of paper between the mount and the clip guide angled face,
  3. Torqued the hex bolt back to 65 in/pounds.
  4. With the paper still able to slide between the mount and angled face with the clip guide key removed, remounted the scope and it was still way off to the left where I don't have enough windage to bring it to zero.
 

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Questions: Are you using a bore sighter or have you gone to the range to shoot it?

Don't get discouraged, we will get to the bottom of the problem
 

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Discussion Starter #15 (Edited)
Questions: Are you using a bore sighter or have you gone to the range to shoot it?

Don't get discouraged, we will get to the bottom of the problem
Using a rifle vise I sight it in at a target using the iron sights. I am waiting to go to the range till the scope and iron sights are in the same general location then at the range I can zero the scope. Currently the scope and iron sights (at mechanical zero for windage) are so far apart I can't adjust the scope windage to compensate.
 

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Are you trying to get the ACOG to co-witness with the front sight post?
 

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Discussion Starter #17 (Edited)
Are you trying to get the ACOG to co-witness with the front sight post?
No, not trying to co-witness just using the iron sight windage to get the scope windage close so I can zero it at the range. I shot this rifle in High Power Rifle competitions using the iron sights and the scope windage is way off.
 

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Discussion Starter #18
Well, no luck with the shims, I can’t get them adjusted precisely enough. I have not heard from Sadlak in a week or so it's on to my last resort which is to let my gunsmith have a crack at it. If he can get it mounted and zeroed that would be great, if not then I might try a Basset mount, Trijicon ACOG TA70, ARMS #18 or a CASM Gen II. Any other suggestions to mount an ACOG on a M1A?
 

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The M14.CA CASM mount was designed specifically to overcome the problems found with receivers that were out of spec at the left side. These mounts attach securely to the rear sight pocket and do not even touch the left side of the receiver. This design came about because I had BTDT with these issues a few times myself.
LAZ 1
 

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Well, no luck with the shims, I can’t get them adjusted precisely enough. I have not heard from Sadlak in a week or so it's on to my last resort which is to let my gunsmith have a crack at it. If he can get it mounted and zeroed that would be great, if not then I might try a Basset mount, Trijicon ACOG TA70, ARMS #18 or a CASM Gen II. Any other suggestions to mount an ACOG on a M1A?
Sorry, MickGIS, I was waiting to hear from you. A Little miscommunication I guess. We were waiting to hear the results of your range or bore sight testing. Have you had a chance to do either of these yet?
 
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