The E series is indeed a "Series 70" style 1911. This means it doesn't have a firing pin block.
Quote:
Originally Posted by scooter123
...it's my understanding that the older models use a series 80 design with a firing pin block. As a result the triggers likely aren't as good as the E series and they are more challenging to break down completely.
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Your understanding is wrong. The S&W firing pin block design uses the grip safety to move the firing pin block. Therefore, it has no effect on the trigger or trigger pull. Neither is it more difficult to field strip than any other full length guide rod gun.