Xlr element I have and it is great chassis. Very accurate shooting had it tourqed up for the last 2 years and rifle still shooting accurately. Previously had aics but too heavy and didn't like the look of the pistol grip on it. With the xlr you get the ergo grip which is a very ergonomic and aesthetically pleasing. I have the folding mechanism on mine and happy with that too. Pm me if you want any further info