Just installed on my PTR 91-GIR. Pro's: It doesn't have as fat a feel as the original, looks great, both sides are symmetrical whereas the PTR grip has a left side hump on the upper left side. Nuetral: it is a tad bit shorter then what my PTR has on it when compared side by side - but doesn't affect anything. Con's: I couldn't get the screw hole to line up at first and the top locking block wouldn't completely seal ( I could see daylight through the top). So, I took off the buttstock took out the trigger pack, pushed really hard and finally heard a click at the top fitting small plastic square and the daylight disappeared and the screw hole lined up. Other than that, it feels great. I would buy it again if I had to. Just my 2 cents worth.