I have used several thumb safeties in the past from all the great makers. Not trying to say they aren’t good too, but there is a huge difference in overall fitment and overall use! This safety can be fit to the gun in every way, especially a true spec frame that is of quality, of course! There is also something to be said about how much more comfortable this safety can be used, especially for a high thumbs shooter. It also helps to engage the grip safety more mindlessly. After I started using these thumb safeties it has been hard for me to use anything else. I almost feel like it makes me shoot. Better which sounds crazy! The amount of detail that goes into one of John‘s parts is unbelievable. In my opinion. His stuff is the best to use. I think it makes a big difference, John, being a shooter himself, designing the parts. He knows what works. Thanks John!!!