Glock or not, I have mexican carried a lot, bottom line, it's good for what I use it for now, which is, knock on the door at the wrong time, holster is off, a quick tuck and go answer the door, not necessarily open it, say " who are you and why are you here? " a noise in the back yard that is not right, same thing, the quick tuck IWB is convenient, but not condusive to running or loose clothing, I have felt the pistol come out of or down my pants, coming out you can readjust, when it go's down is much worse. I dropped a Walther pp .380 into a toilet because I was so used to it, I did not remove it before I let down my pants and SPLOOSH, there it was, luckily I had not become fully engaged at that time, some paper towels and some judicious cleaning later saved it, the gun, not my honor. The Mexican carry is from your car or bedroom to the front door, No mas, no menos. Field expedient, no more. Now this clever device does have some application, but it won't keep the pistol from migrating. Up or down.