Just bought this rifle a week ago. Put 120rnds through it, 6 failures during that so, 95% reliable. The bolt gap before and after was .15mm. It was accurate and fun to bump fire :D. It destroys the brass though, and throws the shells 50-60feet at 2 'O clock of where I was standing. Thinking I'm going to buy +4 rollers and continue putting rounds through it to see if it works out the issues.
I also think that the jams were due to the gun not being broken in, and the fact that it was incredibly misty yesterday.
How would mist make the rifle jam? Just curious. Hopefully it was just the break in procedure. If the jams persist, I'd try different magazines. If that doesn't work, see if the Century goons will fix it for you.