QUOTE(C3Farms @ Nov 11 2009, 05:33 PM)

I am unclear on what is preventing the bolt from closing. Is it a clearance is issue with the base, scope and bolt or is internal problem like screw length?
If I remember right, the shorter screws go in the back...but don't quote me. The screw length is a common problem and easily remedied. I am curious why it works reversing the rear base...that sounds like a clearance thing but if the seating depth of the screws in the rear base are different enough to compensate for the wrong screw length then reversing the rear base would fix the problem. HMMMMMMM very interesting.
Try this...instead of reversing the base, reverse the screws in the base. The next option of course would be to remove all the screws and replace them one by one starting with the rear most screw and testing the bolt after each one.
Good luck and let us know what you came up with...it may help someone else down the road.
JC
I went back to my gun shop and swapped the bases and rings plus $20 for a streamlight stinger led C4. But I did order some plan ole weavers and they work just fine. Thanks for the advice though
WTF