What does IER stand for?

Intermediate Eye Relief (rifle scope)

This definition appears very rarely and is found in the following Acronym Finder categories:

Military and Government
Science, medicine, engineering, etc.

Other Resources:

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Samples in periodicals archive:

Burris revolutionized the world of high-power scopes for handguns with the introduction of its fixed 7x and 10x intermediate eye relief models years ago.

Handgun optics

Long and intermediate eye relief scopes for use on handguns of various configurations have done much to bring handgun hunting out of the dark ages.

Scope that handgun; handgun scopes and mounts have come a long way ...

There are two basic types, long eye relief for use on conventional handguns, and intermediate eye relief for the single shot" short rifle types.

Sharpshootin'