The M40 rifle other than perhaps a few early developmental ones were not 40X but std 700 receivers, the VN contract rifles are all marked 700. Remington production records say a total of 995 M40 rifles made from'66-'71, but its possible only about 700 were actually made and those in the first year. I am a bit of an M40 nut, having put one together of my own nearly 20 years ago and more recently purchased one of the Rem re issue rifles for the USMC Scout Sniper Association. Yah, we good. This is my SSA rifle with Leupold/Redfield 3-9x40 scope in the proper sized Protecto Kaddy case as used in VN.