It'll be #87 - though wear on the interfacing surfaces of the hammer itself, #94, could also be a culprit.
When you pull the takedown levers to pull the slide off, is the back end of the slide colliding with the hammer rather than gliding off?
I've see a lot of well-worn Gs, especially select fire models, that have to have a small tool inserted to hold down the hammer while removing the slide, as it's worn and sticks up in this manner.
Check that out - but, very likely the sear part #87.
Replacing that will likely bring things right back to spec, by the sound of your symptoms (but I'd like to hear your take on the hammer, as well...)
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