Some excellent definitions and explanations. Just bought 2 S&W M&P 9mm for me and wife and boys(13 & 14) and S&W M&P 22cal for daughter(12) She is young and the 9mm is a little much for her. The 9mm is great for the rest of us. Very happy with these purchases. Well done S&W. Looking forward to my next purchases very soon! As for the debate of sa/da, I have nothing to offer as it seems very well covered already. Points to note when using firearms 1-Treat all guns with safety and care in mind first, 2-Guns don't kill people-people kill people, 3-Don't be a dumb-***! Retain your ownership rights. As my one grandpa said to me at a young age..."Its better to have it and not need it, than to need it and not have it." This was the precursor to my other Grandpas statement to me at pretty much the same young age..." It is better to be judged by 12 than carried by 6, do what you must, but know that Heaven is watching, so be just and righteous in your actions." Gotta go, be well.