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Discussion Starter #1
It may be a scope problem (1st Gen 3-9X Redfield) or it may be a mount problem, but I am unable to zero. With the scope's windage cranked as far left as it will go, I am still four inches to the right at 25 yards. I will have to dig through my pile of scopes to see if I have anything to replace the Redfield with, but I am pretty sure I don't have another 3-9X of any flavor. If it IS a mount problem, what are your suggestions? I have heard Burris offset rings mentioned, but I can't find a tutorial on how they work. FWIW, the rifle is an M14 built on an Armscorp receiver with a Douglas match barrel. At 25 yards with this scope and mount combo, it was piling three rounds into one hole....just not in the right place! :)
 

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Greetings Mossy, I have the Burris offset rings on my ARMS 18 and they work as advertised. The offset ring inserts are slightly different with a plus/minus on each matching set.

If you need to go a little to the right the minus insert is on the right side of the ring with the plus insert on the left. Thats all there is to it. Of course HOW much to offset the scope is a trial and error thing.

I tried to boresight the scope with the inserts and got close but in the end it was shoot a round and figure out what to do next.
 

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I had the arms on my armscor m14 as well. Worked perfectly. That's wasn't one of the issues with armscor.what rings are you using?
 

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Make sure your mount is centered. Center your rear sight aperature and tie a thread thru the hole, centered at the top. Run the thread down the center of your barrel, using the gas cylinder or flashider spline as a guide. It the thread doesn't run evenly down the center of your mount's rail, you have a problem.

When adjusting a scope, you will have more windage travel when your elevation is centered. Center your elevation, then adjust for windage.

1" scope tubes have less adjustment travel than 30mm tubes, and high magnification scopes will have less than low magnification scopes.
 

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Make sure your mount is centered. Center your rear sight aperature and tie a thread thru the hole, centered at the top. Run the thread down the center of your barrel, using the gas cylinder or flashider spline as a guide. It the thread doesn't run evenly down the center of your mount's rail, you have a problem.

When adjusting a scope, you will have more windage travel when your elevation is centered. Center your elevation, then adjust for windage.

1" scope tubes have less adjustment travel than 30mm tubes, and high magnification scopes will have less than low magnification scopes.
All good info, Thanks Kurt.
 

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Kurt's got it, mount isn't straight. You can tie a string or just eyeball it looking down the rifle from the front sight. I forget the SN range arms mounts won't fit due to the way the receivers were made.
 

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Kurt's got it, mount isn't straight. You can tie a string or just eyeball it looking down the rifle from the front sight. I forget the SN range arms mounts won't fit due to the way the receivers were made.
You might be wrong on this one, there was some inspec issues for the last batch but the scope mount screws and notch wasn't one of them.
 

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You might be wrong on this one, there was some inspec issues for the last batch but the scope mount screws and notch wasn't one of them.
About 10 years ago some receivers left the factory with shallow grooves. Some mounts won't go on all the way to the bore centerline.
 

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A.R.M.S. mounts are hard to make work on receivers that are not exactly to print in the dimensions of the scope mounting area or stripper clip guide mounting area.

Try removing and the reinstalling the mount. Don't be afraid to play with the threaded adjustable bushings at the receiver barrel ring and stripper clip guide. Start with the cap head screws out and the bushings backed as far off as they can go. That way they are completely out of the way when you thread the mount screw into the side of the receiver.

All else fails, and you'really set on a 3 pt mount go with Sadlak. Sadlak also makes an inspection kit that you can check the tolerances and dimensions of your receiver with.

Good luck.
 

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Discussion Starter #12 (Edited)
In this case, the mount is BEYOND the bore centerline. I threw a straight-edge on it, and it is just a touch over to the right from centerline. That leaves me the option of shimming (not quite sure how that would work out), of going with the Burris offset rings. Rings are on order, so we will see what we can do with those.
 

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I thought about this thread, then forgot about it until I read your posting on another thread. Sorry about the delay.

My main shooter rifle is an Armscorp, A0057XX. I mounted a scope on mine to do some load testing etc. Didn't like using the scope, so don't use it much. I didn't have any problems with mine. Bassett Machine mount, Millett rings, and a Weaver 2-10X.
 
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