or if you like self indexing.remember all the hoo hah about this gun back in the day.glad to say that most fears where greatly exaggerated.i owned the standard h5 scout fantastic,utterly accurate rifle.human nature dictates that you need better,so i went for the semi auto,sorry self indexing.i use my rifles for hunting,and as such as airgunners we are trained for one shot to the head or if very confident heart lung.not once have i used the semi auto feature,yes you dont have to recock but that is the only gain that i can see.maybe fun for plinking,dont tend to plink much.nice to have,bit like launch control on a performance car.