The ILS is not in lieu of the firing pin block, the titanium firing pin is. But you are correct, Springfield does not use a firing pin block in their 1911's.No SA pistols use a series 80 style firing system. All newer SA pistols minus custom shop guns, use the ILS system in the MSH.
So yes, the Operator is a series 70 style gun.
Yes, the MC Operator has the series 70 firing system, just like the original Colt 1911 pistols.Does the MC Operator have the series 70 firing system?