Let me recommend before attempting to polish the sear surfaces, install a new mainspring. Original mainsprings take a set, lose compression and because the spring forces on the firing pin sear and trigger sear are less, the trigger will be mushy, creepy, and may not return when partly pulled and released.
Only attempt trigger polishing after installing a new mainspring. Polishing is risky because it is easy to alter the angles of the sear surfaces. The surfaces need to be flat, not dished, and they have slight angles (that you can't see! ) that reset the trigger when partly pulled and released.
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