I am sure my thoughts are probably way off base here but you buy a compact because it is easier to conceal, correct??? The hard part of an auto to conceal is the grip, it isn't the slide, so putting extended basepads on the compact negates so of the ease of concealment you bought it for. Sure, extended basepads or sleeves for the full size mags would make it more comfortable but if one is involved in a shooting that needs more rounds than the compact allready has, well I'd think the comfort of the sleeve is going to be the furthest thing from your mind.