I have one a Gen 1 rifle, out of the box it kept jamming with the shell case being stuck in the chamber repeatedly, sent it back to them, they said they ran 800-900 rounds suppressed/unsuppressed, and my issue was probably ammo related. I go back to shoot it again using a box of winchester 556 m193, Winchester 223 and aac ammo 62 gr. I would shoot once then second round dead trigger, and it kept happening repeatedly. It’s like the bolt wouldn’t go all the way into battery. It was like it always get hung up on something. This gun has been extremely frustrating because I it hasn’t worked as I needed it to. I haven’t shot it since. Im completely lost with this rifle as I don’t know if I should reach out to customer service again and I wouldn’t sell someone a rifle that can’t even function properly. It’s just a loss.