I appreciate all of the positive and complementary replies. I did get to the range last week and it performed perfectly with both .38 and .357 ammo. I did learn that the rear sight adjustment is a bit different that my Smith revolvers.
I would not bother with the soak. These trigger groups are a tight fit as you can see by the lack of a gap where it meets up with the frame. If you can't move the plunger, you may need to spay something in there to get it loosened up, but I am guessing it is just bound from years of sitting and may have some gummed up oil keeping it from plunging in and out.
Once you get this plunger loose, while holding/pushing it in---pull down on the rear of the trigger guard ring. It should open right up.
One more word of caution to pay attention to. When you go to snap the trigger group back into place, hook the front tab into place then rock the back upward until it snaps into place. HERE IS THE CAUTION PART---make certain that you don't have any skin between the frame and the trigger group. I am talking about finger skin or thumb webbing. When it snaps into place and you have skin caught in between, not only will you squeal and dance but you will then remember how tough it was to depress the plunger and pull down on the trigger group----and that was using both hands. About the same time you remember this, will be about the same time you realize that you are home alone, or that your wife will be absolutely no help in getting the gun to release you.
Remember you read it here first and have been warned.
I have a 1st year, 1972, Security Six that I got from Forum member Toyman last year. Before he got it someone bubba'd the back strap for reasons unknown...
If you aren't handsome, you better be handy, that's what I have heard. I can say that my GP-100 has been a very handy revolver.The Ruger series of revolvers have aged well. This is your Security Six’s grandson. I put in Wolf springs; easy job. I think the rear sight Ruger uses is a let-down. So my GP100 now wears a Bowen rear sight. The fiber optic Rod went MIA. So I located a pin of correct diameter, ground it to length and super glued it into place.
With the Wolf springs, my gun has a really nice action. The single action is right around 3 pounds. The double is nice as well. No fail to fires. My 50 yard steel target is 20X12 inches. If I’m having a good, steady day “groups” are 7 inches or so, offhand.
Rugers aren’t as pretty as a Smith or a Colt. But they’re handsome in their own way. Mine is a good shooter. Any 44 Special is special.