I was watching a U-tube video about a Colt 1911 vs a Rock Island, both in 45 ACP. The guy doing the video is very experienced. He mentioned the possibility of an unintentional discharge IF you used the slide release to charge the pistol, after an empty mag lock-back. His reasoning was firing pin inertia. His Colt was a series 80 and he demonstrated the firing pin would not move forward without the trigger being depressed. The Rock Island was a series 70. Since the firing pin can move forward if there is no block, I get it that it may be possible. But if that could happen it seems to me it could happen every time the pistol reloads when the slide slams forward and the hammer is locked back on the sear. I believe I read where the some Colts have titanium firing pins which are lighter than steel to make them less likely to fire due to inertia if the pistol is dropped. So my question is this: Is it possible for a non-series 80 1911 to fire if charging using the slide release? And does anyone know if most firing pins are made of steel or are lighter materials used to minimize drop firing events?