Posted by Tom Martin on August 30, 2017, 11:45 am, in reply to "new to me lc 12 ga."
There are only two pieces that are really different between a 2 and 3 position safety, the safety blade and the safety spring. There is no difference in the frame, so installing a complete safety assembly should be all that is required, as the 3 position safety spring will work with either style safety.