sprockets arent gonna do anything to gain power.
but even tuning a stock bike helps out alot ... smooths the powerband out.
eliminating the pair valve system helps alot when tuning
it can be used as both, thats what there website says.
you can just move the clips to the back.
or you can order the belt loops off there website as well and put them on the holster
i want to add, if you are replacing the actual throttle tube.. which is plastic... dont put anything on it. it should have just the plastic to metal contact. if you put hairspray or shit like that it will make the throttle stick.
but if your just installing grips.. rubber grips no throttle tube then you can use any of the methods above and that includes if you are installing a grip onto the throttle tube... besides the tip about grease.
may fit other glocks, your welcome to throw your glock in it to see if it fits.
i bought this and a Kholster, and since using the Kholster i dont wear the this one
$50
http://i131.photobucket.com/albums/p301/hoblick/glocksog.jpg