The series 80 trigger firing pin block plunger lever add an extra degree of difficult in reassembling the pistol. I have enough trouble assembling the series 70 sear and disconnector parts and the addition of a plunger lever makes reassembly even more difficult.
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But the real killer, in my opinion, is the firing pin block plunger. It is spring loaded, it points down, and I have had the thing come down and block slide closure while shooting the pistol. It just takes the right combination of firing pin position and bad luck, but it will drop down when the slide is back and prevent the slide from going into battery. Because you cannot see it (easily) and it is something that takes a pointy object, like a chop stick, to push back in place, along with a chop stick to push the firing pin forward, I consider this unacceptable in a self defense weapon. This device is fine at the range, you can take all day with the pistol on the shooting table to puzzle out why your slide is blocked open. And you can go to your vehicle and find something to push down on these devices. All you have done is waste shooting time. However, if it drops down in an emergency situation, I don't believe the opposition will stop what they are doing in order for you to fix your M1911. Assuming you can recognize what is going on.