To me it adds balance to the rifle. Offsets weight of the scope giving a lower center. 10 rounds is plenty for me no idea what a 17-20 is sposed to give ya. Can't say I'd want to carry that all day. To many I'm sure it just adds to the tactical/zombie killer look of the rifle. I like the idea of a few extra rounds in a hunting/scout type rifle. Haven't done this to my Axis yet but plan for it as a winter project. Why? The challenge? The entertainment value? Makes me happy thats all that matters.