Just tried mine out for the first time, not such good luck. In about 80 rounds, was unable to get through a full clip w/o a FTF, also had a few FTE and a couple that just wouldn't fire, even when rotated and tried again(Remington T-bolts, recomended load).
At that point, while checking gun after yet another FTF I found the rear sight moving in the dovetail and ready to fall off the gun. Called it quits after that that, am going to completely disassemble both magazine and top end to clean and lube, figure out how to tighten rear sight (looks like there's a set screw to do so but appears as though sight will have to be disassembled to access it) and then try again. Maybe a good lube is all it needs, it is kind of "sticky" when cycled. when it did shoot, seemed ok. Disappointing start, hope it gets better.
Manny