Thumb Screws Loose

I guess part of blogging is sharing errors that you've made, as well as all the fun you've had.  As I was at the range today, it seemed that I was chasing the crosshairs trying to get a good zero.  I kept checking the torque on the screw that holds my scope to the carry handle, but didn't check the two thumb screws that hold the carry handle to the upper receiver.  Under recoil, the entire handle and scope would slide, and surely affected the point of aim.

Lesson of the day...tighten the thumb screws REALLY TIGHT!

All things considered, I still shot some nice groups once I was done chasing the 'zero' around (I remembered my sandbag front rest today).  My final shots are highlighted in yellow...