As far as I know, no trigger work or anything other than factory. I bought it used at a gunshop. Apparently the original owner shot 6 rounds and traded it at a loss! I have only shot full house loads on 2 occasions to familiarize and sight in. Otherwise I use 240 grain lead Keith style boolits over 8.0 grains of Unique. Normally does all I need. I like the revolver, but online all I read is trouble with these. I am heartened to hear of others with no problems. I will send back to S&W, then give it a second chance. It is nice to pack during woods bumming. I really appreciate the responses. Feel free to continue with personal experiences. MK