In spite of Slamfire's "interest" as soon as that word is used, the Series 80 firing pin block was not installed to prevent slamfires (which, as the term is generally understood) have never been a problem with the 1911. The issue was that a pistol dropped ON THE MUZZLE from a 10 foot height onto a solid surface fired due to the firing pin moving forward from inertia. It did not happen when the gun went into battery while firing normally.
IIRC, the pistol in question had a full length guide rod, which did not allow the energy to be absorbed by the recoil spring, as would have been the case with a "GI" recoil spring guide.
As to a gun with a loaded chamber and a lowered hammer falling on the hammer, the inertia type firing pin prevents that; the firing pin block is unnecessary.
Jim
IIRC, the pistol in question had a full length guide rod, which did not allow the energy to be absorbed by the recoil spring, as would have been the case with a "GI" recoil spring guide.
As to a gun with a loaded chamber and a lowered hammer falling on the hammer, the inertia type firing pin prevents that; the firing pin block is unnecessary.
Jim