I have used it. In my case, it was like the mickey mouse version of the sorcerers apprentice. I looked at all the utube videos, and did a good job of building and molding a grip for my mx-15. I have a big hand and use a precision trigger. I built the grip to put my hand forward and to fill up my hand. My scores, especially in handicap have be horrible. I felt like I was flinching, that the trigger was broken, that the gun was not staying put in it's alignment. A friend who has shot pistols competitively was telling me about hand placement and how, if improper can pull or push the shot. In desperation, I removed the rat grip and went back to a glue on palm swell and tennis rap. All was well again. The stuff works well and will not damage the gun. But you better know what your doing! I sure didn't. Bruce