The Century C39, V2, and RAS47 are showing signs of problems with their cast parts. Don't know if it was a bad batch or what, and its hard to tell at this point whether Century screwed the pooch or Not. Century isn't saying a whole lot about it either.
Most of the problems seem to be showing up between the 1k and 2k rounds mark. I have a rAS47 with 950 thru it and am worried about it and keeping an eye on mine.
I have heard that the same company supplies the cast parts for DDI but havnt heard anything bad cropping up in DDI rifles so who knows the extent
Jim Fuller, Rifle Dynamics, had commented on this issue previously.
http://www.akfiles.com/forums/showthread.php?t=237240