I added this strap to a Aimpoint CompC3 optic. It keeps the battery cap and adjustment cap attached to the sight. It's most useful for keeping the battery cap attached to the optic when changing the battery. Mak sure your battery cap has the small nipple on the end for use with this strap.
Pros: See Title.
This review was written in the old system and had content requirements that are different than reviews written today.