If I were to have S&W's ambi safety added to my non safety m&p will I run the risk of a voided warranty? Obviously I have yet to contact m&p personally, but figured this would be a good place to ask as well.
Thanks in advance.
Only S&W is going to be an authority on what specifics they consider to void their warranty. I'd be shocked if they said this would (they have generally great customer service), but why not email them and get a response if you're worried about it.