I bought an early one for $509.00 switched the magazine to Glock feed and haven't had malfunction one. After an outing to the range I noticed light rust on the magazine release and cocking handle so I don't know if the finish was light or what. I just make sure I wipe it down after use now. It IS a pound heavier than my Colt Carbine so I lost that one since I bought it as hiking gun. Get one. SO much fun!