martin wrote:Thank you gentleman, we have success.
I cleaned all again with brush and carb cleaner trying to flush the spring section too.
Much better strike by firing pin
Much appreciated all the patients and advice
Don't celebrate too soon.
I am surprised that nobody commented about the inertia firing pin which is a design feature omitted from nearly all modern bolt action firearms.
Chances are the real issue is a weakened mainspring inside the rear portion of the bolt.
If some of your cleaning solvent found it's way inside the rear part of the bolt all it has done is softened some oxidised oil or congealed grease inside, only for the problem to return when the solvent eventually evaporates.
Better for you to find out how to dismantle that part of the bolt, clean inside and do something about the mainspring.
In the first instance I would try to stretch the mainspring so as to strengthen the firing pin blow. If I wasn't able to stretch it so as to result in permanent lengthening then a relaxed mainspring is unlikely to be the problem and detailed cleaning and the lightest possible lubrication would be in order.