Never say never with CSMC. The RBL-410 is a new production gun. They simply don't have the capacity to make all models as limited production guns.
You pay a bit more but you can still get just about anything you want. Obviously, the most cost efficient way of buying guns from CSMC is on the initial offering and deal with minor changes in advertised specs, 1 year delivery, etc. I've done it with all but one of the guns I've bought from them and have never regretted it. All the CSMC guns I own are of outstanding quality and worth more than what I paid. How many guns can you say that about?
I guess that's why I find it difficult to understand all the complaints about any or all of the above. If you want a truly custom gun, be prepared for a long wait and 5 times the cost.