I got my FIST "#1AK" holster -- that's the kydex version of the #1 IWB clip design, made with their 'thin' (not ultra thin) Kydex. I'm Kydex all the way for IWB, and usually get Comp-Tac's holsters. Since they don't have one for the M40-A1 yet, I decided to give FIST a try. Of all the Kydex holsters I have, this is the strangest looking one I've ever seen. Basically, it's like a leather holster... made of kydex. They actually sow pieces of Kydex together as if they were pieces of leather. I'm assuming it's either glued or heat treated in addition to the stitches. Bottom line is the gun fits, the clip holds the belt, so it's all good. Anyone else have a FIST Kydex? Have they held up well over time?