I am new to shooting a .308 and recently picked up a SA St. Victor which I love. However, when I broke it down for cleaning, I was unable to remove the retaining pin to then remove the firing pin. I see the retaining pin is different from my .556 and I couldn't find much on the web about it either. I attempted to push it through and no matter what I tried, no luck. Is there some type of special push I need to remove it? Any assistance would be greatly appreciated.