I feel bad for you, I know it doesn't help, but I'm sure most readers of this thread feel the same. So why not try something different?
I've made a practice of abandoning companies that don't back up what they sell; sometimes I've complained, sometimes went farther than that. Mostly it didn't work. In the past ten years or so I've taken to commend, in writing to appropriate outlets, good service from companies I've dealt with. I'm proud to name a few recent ones: Nielson-Kellerman (Kestrel), Leupold-Stevens, Wheeler Engineering (tools & bore sights), many if not all small mom & pop businesses that sell a specialized product like 21st Century Reloading, some I can't remember. My point is this: they'll even go so far as to be aggressively seeking to please the customer. I am truly sorry for missing so many that go this far, but they know who they are, what they do, and can look proudly in the mirror in the morning...
If MRC wants to stay in business they need to develop a customer-oriented service policy similar to those previously mentioned. And here's the different approach (sure took me awhile to get here huh?): Send them this thread and let them see what poor PR they've reaped. We are all here focusing on long range something and we've joined together to share experiences to better our craft. We can also use the power of public opinion as well as our united interests to obtain a favorable outcome for members slighted... We all hope that MRC--and others--elect to use their better senses, see the big picture, and their own bottom-line and do the right thing by the very people that make them possible.
Forget the stock, barrel, scope, et al., they should send you a new rifle!