So you have that brand, spanking new EVO and you put an Aimpoint or any other RDS on it that uses a CR2032 battery.
As you know, batteries die on you at the most inopportune moment, thus you take a spare on along.
But where to put it, if your sight doesn't have a raised mount ala LaRue T1 mount.
Simple, the EVO comes with its own little battery compartment

