The M5 runs the AICS magazines. It is not the standard Rem 700 inlet for bottom metal. I'm not sure how much weight you would save, if any, with the standard Rem 700 bottom metal, but it isn't much. 9.5 pounds is pretty slim for the whole shebang I had there.
Length of pull is 13.5 inches.
The trigger is sold. I will sell the action, stock, and bottom metal for $1500 shipped to an FFL.