Browning CX are very tight coming out of the factory. If you don't see any wear marks from misalignment, try this technique. First use a white lithium grease on the hinge and gun oil on the other moving parts. Now, you need leaverage to open and close stiff O/U. Extend your FE grip out to the end of the FE. This will give you leaverage to open and close. Try it, it's that simple.