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I think now and then Simon at S&J hardware will sell some of his demo guns. if not, im sure he would be open to building the gun for you. his service is top notch, PM him, he is 'badboybeeson' on here.
Not to takeaway from Casey or TacOrd but as manbearpig said, the fun is in that hassle and I personally feel great when I finish a "custom" personal build
If you are not mechanically inclined and have no time to do it, it's not fun.
I'm doing my M4 CQB and it is so painful waiting on parts. I still need a shell holder and a flashlight. I bough this gun Nov 2010 and I still haven't shot it yet.