No offense taken. I don't know Rguns at all. I was just scanning SlickGuns and saw it. I was just about to try to redeem myself by posting about a PSA middy 16" for $399, no bcg or ch. But I just double checked and they look like they are sold out. I DO have experience with PSA and it has been all positive.
Those uppers take 4-6 weeks to deliver. Plus they have gone up $60 on their premium uppers. Got mine for $349 and took a bit over 4 weeks to deliver.