Loading... Please wait...

our newsletter

Account Navigation

  • Gift Certificates
  • Wish Lists
  • My Account
  • Order Status
  • Currency Converter

    Change

Spuhr

ismis.jpg

 

HOW TO CHOOSE THE RIGHT MOUNT

We have the worlds most comprehensive line of tactical scope mounts; it currently spans about 45 different models of various heights, tilts, lenghts and ring dimensions.
Here is a short guide to help you choose the right one for your needs.

Picatinny or direct mount?
The first obvious question is if the mount should be a Picatinny mount or a direct attachment mount such asour line of ISMS mounts for Accuracy International, Sako TRG and Sauer SSG.
The main purpose for using a direct mount is to allow a stronger and lower positioning of the rifle scope. If there’s no need for Picatinny we generally recommend direct mounts on these rifles.

Tilt.
Tilted mounts are necessary when shooting at very long distances. We generally recommend as little tilt as possible as the tilt really does nothing to improve the picture quality. In most cases 6-9 MIL (20-30 MOA) will have no negative impact on picture quality while a greater tilt can
lead to problems.

To allow for the greatest available range of adjustment choose a mount with a tilt that is half of the scope’s range of elevation.
For example Schmidt & Bender 5-25x56 have a maximum 26 MIL (93 MOA) in elevation, then choose a mount with 13 MIL (45 MOA) in tilt. Doing so assures that you are able to adjust the sight out to very long distances.

However when mounted in this extreme elevation it’s common to experience optical defects such as an oval picture etc.
We therefore recommend that when fitting a large elevation scope (such as 26 MIL/93 MOA) on a .308 rifle that will only be used out to 1000 meters, to choose a 6 MIL/20 MOA tilt as it’s more than sufficient for that use.

Height
The height of a mount is always measured from the top of the rail to the center of the scope. In the case of a tilted mount the measurement is made at the rear of the mount.

Night vision/thermal compatible
When combining the scope with a clip-on system such as PVS22 or NSV 80 to name a few the height of the mount is not important. Also the instrument doesn’t have to be perfectlyin line with the scope.

If we have an offset of 10mm in height betwen the primary optic and the NV clip-on the change in point of impact will be 10 mm on 100 meters as well as 10 mm on 300 and 1000 meters; thus the point of impact change is fully parallell.

Therefore it’s often unneccesary to have extremely high mounts just to facilitate in-line mounting of a clip-on systems. Various systems allow varying degrees of angular difference. A common maximum angular  difference is 2 degrees.

Please consult the manufacturer of the thermal device before you make expensive alterations to your gear.

Sort by
Back to Top