D.O.P.E is either Data On Personal Equipment or Data Observed from Previous Engagements.
Regardless under the clock you need to have the correct inforamtion at the correct time and your Data presented in the clearest way to your shooting position.   The YowTech DOPE Card Solutions attempts to do that in your own hand writing!!!     The system will attach to  a dimensionally correct picatinny rail and needs to have a minimum of 11/32" or 8.5mm of clearence between top of you rail and scope.  The complete system installs and uninstalles without tools in seconds.  For non-compliant picatinny rails the system can lock on by bending the bendi...Yes I said bend the bendi.   
 
Included in you YowTech DOPE Card Solution:
DOPE Card Solution in Black, Tan, or Green
Bendi thing in black
Picatinny mount
3 washable DOPE Cards (Beefy Credit Card thickness)
Non-Perminate marker in Black Fine or Pro Pack of 4 colors in Super Fine