With my 243 M-99 pictured above; i ordered the barreled action and the stock from two different purveyors, and put them together myself. No problems there. All the metal from MRC is good.
On the CZ Model 3, i just wasn't in love with the factory stock. (I have forgotten who made it for MRC.) I restocked with a New Haven Winchester M70 stock from CDNN; they were on sale for like 60$. (and bedded with Brownell's Acraglass.) My only complaint, and its not a big one, is that there is just a little play between the floor plate and the bottom metal. It's just a few thousandths, and the magazine spring keeps everything tight so theres no noise, etc, but i mention it because it is less than prefect. However, i imagine that with MRC's name on the rifle and not CZ's, MRC wouldn't let it out the door like that.
ETA: i recall a few months go there was a thread here about someone complaining about the lack of polish and machining inside the receiver of their MRC rifle, but can't find it now with the search function.