I know that people were initially underwhelmed with the UTAS XTR12 (AR-10-style shotgun) and there was a thread which documented numerous malfunctions. In the interest of providing another data point, I figured I’d share my experience.
I have one and it has so far run flawlessly. I have somewhere between 50 and 100 rounds though it. I’m not as lucky as some of you range-is-my-second-home fellas are, so shooting happens around my very busy work schedule. :-) But with those 50-100 rounds, I haven’t had any issues. I bought it used and the previous owner reported that it ran well for him. He had no shortage of videos which showed mag after mag of semi auto dumps.
I have exclusively run Remington Slugger 2 3/4 length rifled slugs through it. I was advised to only run high brass shells that have a minimum of 1,300 FPS velocity, and the Sluggers have 1,500+.
One thing worth noting is that I absolutely hate loading the magazines. It’s tricky to get a shell to slide back into the mag without its lip catching on the front of the brass of the round below it. But that’s the only complaint so far.
For now, it’s a range toy. I won’t trust my life to it until I’ve run hundreds of rounds through it without incident. If it goes to crap on me (as it has apparently done for so many other folks) then I’ll let you guys know. But so far, so good.