The EXPS2 offers true 2-eyes-open shooting and provides an
unparalleled targeting experience. The all-purpose EXPS2 features
easy-to-adjust side buttons and a quick-detach lever. It has a
transversely-mounted lithium 123 battery. The increased height of the
EXPS provides iron sight co-witness access in the lower third of the
viewing window. Whether you're using the sight for law enforcement or
hunting, the EXPS series sights are the premier optics in the line.