the general thinking is to AVOID EXTENDED SLIDE STOPS like the plague- as they can ride up and stop the slide from returning- if that's the case, it's a wasted 40 bucks for a wilson( i know, i see one every time i go to the range) "the extra mass of the extension CAN cause malfunctions of erratic frequency and some shooters with longer fingers can get a thumb onto the slide stop and prevent it from locking open the slide when they run dry"- guns and ammo, book of the 1911. pages 119-120- kind of puts you off one, doesn't it?