What you refer to as "pins" are the three bride screws (four on grade 3 and higher guns) and one sear axle. All of which are threaded into the lock plate.
Once you have the plates out, look at both of them side by side from the back side. Move the hammer so you can see what is going on. It should be apparent as to what the issue is when you can see everything.
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B. Dudley
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