Warning

 

Close
Confirm Action

Are you sure you wish to do this?

Cancel Confirm
AR15.COM
AR Sponsor
5/2/2013 9:10:33 AM EDT
I'm getting confused (it happens often). I have an ADM one piece mount with no cant and have zeroed by .22 at 50-yrds but only have enough elevation to get to 100 before i have to hold over. That works ok but if i want to shim the scope to increase my elevation do i shim the front or rear scope mount ?
5/2/2013 9:30:04 AM EDT
[#1]
You want to angle the scope down (pointing it at your low bullet impacts at 100y), so shim the rear up.
5/2/2013 10:05:42 AM EDT
[#2]
I would be very careful shimming scopes. If anything, you only want to add a single cutout from a coke cans worth of shim to the rear.

The reason I say to be careful is because if you add a shim to the rear the path of the scope rings is not perfectly strait. In other words, the rear mount is a fraction of an inch higher than your front ring without being angled appropriately. Think of trying to put a strait metal rod on two stacks of bricks that are piled up at different heights. If you tighten it down too much you can destroy your scope.

If anything, you need to get either new rings or a new scope. They make rings that are 20moa canted for long range shooting, but I'm pretty sure you can find others with less of an angle.
5/2/2013 2:14:50 PM EDT
[#3]
Quoted:
I would be very careful shimming scopes. If anything, you only want to add a single cutout from a coke cans worth of shim to the rear.

The reason I say to be careful is because if you add a shim to the rear the path of the scope rings is not perfectly strait. In other words, the rear mount is a fraction of an inch higher than your front ring without being angled appropriately. Think of trying to put a strait metal rod on two stacks of bricks that are piled up at different heights. If you tighten it down too much you can destroy your scope.

If anything, you need to get either new rings or a new scope. They make rings that are 20moa canted for long range shooting, but I'm pretty sure you can find others with less of an angle.


+1
5/2/2013 3:28:05 PM EDT
[#4]

What he said, unless you use Burris zee rings. They have inserts which would account for this. Oh and the zee rings won't scratch your scope
Steve

Quoted:
I would be very careful shimming scopes. If anything, you only want to add a single cutout from a coke cans worth of shim to the rear.

The reason I say to be careful is because if you add a shim to the rear the path of the scope rings is not perfectly strait. In other words, the rear mount is a fraction of an inch higher than your front ring without being angled appropriately. Think of trying to put a strait metal rod on two stacks of bricks that are piled up at different heights. If you tighten it down too much you can destroy your scope.

If anything, you need to get either new rings or a new scope. They make rings that are 20moa canted for long range shooting, but I'm pretty sure you can find others with less of an angle.


5/3/2013 1:42:56 AM EDT
[#5]
Thanks guys. I don't shoot it much beyond 100-yrds so should probably just leave it as is. Thx
5/3/2013 6:31:20 AM EDT
[#6]
With some of the not so perfect rail to mount fit you can shim under the mount
instead of in the rings but this depends on if you have room under that amount on top the rail.
5/3/2013 7:36:16 AM EDT
[#7]
Sell the ADM and get a LaRue LT-158 SPR-S.  It has 10 MOA of cant.
AR Sponsor