After 5 weeks, my FIST Kydex IWB holster finally came in and I've carried my new Glock 27 Gen 4 the last couple of days. The rough grip on the side of the grip sure lets me know that it was there. When driving and sitting too long it definitely has the ability to cause some pain. I'm not a T-shirt under the shirt kind of guy, being a few 20, er 80 lbs over weight. I didn't want to, but I'm going to have to put a slip on grip on it.