The rifle is bought new and model 12 with accu trigger. No adjustment is made to the original setting of the trigger which is believe is set at 1.5lbs. However, the problems normally occur to the military surplus ammo. If it did not fire on first attempt, i just lift the bolt, press the trigger, it will fire. This is what makes me think that the spring at the firing pin is weak, I may be wrong and I am just guessing. What is meant by firing pin not set correctly? Thanks.