The one in the picture above. It is the original stock that Savage sells with their factory FClass model. I promise you if you have a little mechanical aptitude learning this skill is not very complex. It requires patience and carefulness but is very doable. Jim will walk you through all the installation process. I got two target actions right bolt and left port which I simply love. When I first took this road I called Jim asking for a dual port but after a few minutest align to him I realized I really wanted the left port.