Does anyone have any experience with R Guns. http://www.rguns.com/ I've read a lot on line and it seems a mixed bag. Most of what I read about their products is pretty good. Their promptness and social skills answering emails and phone calls, well not so good. They say they are shipping uppers in about 4 weeks give or take. I've been trying to find a 20" upper to finish a AR project with a wood stock. I'm not really in a hurry but would like to get one on order. Any opinions?