OK, assemble the internal parts, then install the sear/trigger spring, the mainspring and the grip safety. You may want to use a slave pin or a punch instead of the grip safety pin until everything else is in place.
When that is all OK, pull the trigger and squeeze the grip safety and hold them. The hammer will go right in and you can line up the hole and install the thumb safety. When you release the trigger and grip safety, the mainspring will engage the hammer and you are in business. If you have used a punch or a slave pin, use the regular pin to drive it out.
Jim
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