A little.
I have a CNC Billet Aluminum tube fed trigger guard for a Winchester model 77. I have then polished or hard black anoidzed.
About $350.00
None
Your Winchester model 290 ranges in price from 90-200 dollars based on overall condition.
look for the # on the trigger area
Do not attempt this. Have it done by a gunmsith.
The Sears 200 is a Winchester Model 1200 with some minor modifications. Winchester 1200 of the same gauge will fit the Model 200 receiver. Buttstock and trigger group will not interchange.
You don't unless you are a very skilled gunsmith.
Best left to a factory trained gunsmith.
If it is a newer model it should be right in front of the trigger guard.
To adjust the trigger pull on a Winchester Model 67A, first ensure the rifle is unloaded and safe. Locate the trigger adjustment screw, typically found on the trigger assembly. Use a suitable screwdriver to turn the screw clockwise to increase pull weight or counterclockwise to decrease it. Make small adjustments and test the trigger pull after each change to find your desired setting.
Yes,these rifles were blued at the factory at the time of production.