Boss - All you had to do was ask.
I've been using them on my rifles/carbines for a year+. The only one that's still stock is my HP Service Rifle. I got the ones on the carbines before they were packaged with the plug and the gappers (since retrofitted w/gappers). I would recommend the gapper for anyone wanting to improve whatever grip they finally decide to use. The overmold makes a world of difference in the grip and the extended length of pull (trigger to rear of grip) fits my meathooks a lot better than the issue grip. It makes for a much more natural positioning of the trigger finger. Wish I could use it on my service rifle - the stock grip designed for smaller hands makes for a less than optimal (for me) angle of the trigger finger - that's why my SPR has the Ergo Grip. Overall, I too am very pleased with the Ergo Grip. That and they're a class act. I stopped by their booth the last day of the SHOT during the "mad minute" and they took the time to chat and square me away. Good people, good product - seems to go hand in hand. My .02 - Peregrino