Well I finally got to the range the other day to try my XCR, I only had about 120 rounds with me since I knew that my time was limited. I was using American Eagle and Magpul P-Mags, there was only one malfunction a FTE on the second mag about half way into it. All told I went through all 120 as fast as I could pull the trigger. The gun was so hot that it was smoking but it functioned flawlessly except for the above mentioned round. I won't be going back out to the spring thaw though, I had to wade through snow up over my waist to set up th target and it was only 15 degrees without the wind chill. All told I am very happy with the XCR.