what do you store in yours?
Absolutely nothing.
I don't carry my AR "in the field", so everything most guys carry in the tiny compartment I carry in my range bag.
I'm planning on carrying a reduced size copy of my stamped form 1 in mine.
I know some guys that will roll them up and put them in the storage tubes in their stocks (ACS/VLTOR, etc).
about 3 years worth of Aimpoint batteries.
So you're saying you don't store any optic batteries, right?
Augh, got to it before i did! What type of plug are you guys using? Homemade, or do grips that aren't the A-2 style come with plugs or a "floor plate"?