This is as job best left to a factory trained individual. If you do it yourself, you might void the warranty.
Smith and Wesson Model No. 2
The Smith and Wesson model 27-2 denotes that there was a second engineering change to the original model 27.The second change indicates that Smith and Wesson changed the cylinder stop,and eliminated the trigger guard screw.
Depends on the model
Take it to a gunsmith.
Let a gunsmith do it.
no it does not. that's why the trigger pull is so hard..
you need to see a gunsmith and have it tested.
No serial number provided; no way to answer.
Best to ask a gunsmith for assistance.
Needs to be tested using a trigger pull gauge.
Sounds like an after market modification.
Someone modified it.