Before I box it up for a trip to Coles, are there any suggestion. Symptoms are failure to tranfer from one barrel to the other barrel after fireing. I can manually select the second barrel an it will then fire. I suspect sonething in the transfer bar system
Take the stock off of the gun, locate the inertial block spring and inertia block lever spring (#'s 94 & 88 in attached image) - most likely the inertia block spring (94) -chances are one of these is broken. If not broken then clean action well and try again.
If broken... You will need to know the wire diameter of the spring wire, then call Coles - they should have it in stock, but there are different diameters so you will need to know that up front.
Ask to speak with 'tech' and they can explain the springs, how to change them, etc. - It is easy to do, you just need some guidance.