I have a small bore English SxS boxlock made in late 70's, early 80's. Very few rounds have ever gone through the gun. About 50% of the time the right barrel does not fire. You can check the shell and the hammer is hitting the shell hard enough to make a dent - just not fire. Type of shell used does not matter either as I have used different brands. Left barrel is just fine.

Thoughts.......?

I would have already sent it to my friend Kirk Merrington but want to avoid the hassle of packaging and shipping if I can.

Thanks in advance!