Not to turn this into a my brand is better than your brand but here are my observations. Yes they are highly insightful and technical and with both those and buck you can get a cup a coffee.
Sheslingers AR-15 is a Bushy. It is a very nicely put together, fit and finished firearm. It has been stone reliable and looks great. It came with a hard case and sling which may not cost must but are nice touches. We got a smoking deal on it.
The RRA's I have seen, seem to have a rougher fit and finish then the Bushy's and price being the same or close I like the Bushy better. I would say the Bushmaster is worth $50-$100 bucks more than a comparable Rock River. When we bought her Bushmaster the price of the Bushmaster actually came out lower out the door then the RRA. If it had been different we would have a RRA.
Now based on my experience with this Bushmaster I really think I would buy from them again for a couple of reasons. First and foremost, I am completely satisfied with the product. It is the first AR-15 that has really brought me around to the way of the AR. I traditionally have not really cared for them but this one did it for me. I guess it was just time.
Second I really think they are a pro-second amendment company and I think they are getting the shaft over the "sniper" murders. I use the term sniper very loosely. I really would like to give them some more of my money. Sort of a legal fund donation with the benefit that I get a nice gun out of it.
Just for the record I don't want to belittle the pain and suffering of all those affected by those animals. I realize their pain must be great and that they are just lashing out looking for some closure. I just don't think they are lashing out in the right direction and I feel I want to support Bushmaster.
Would I buy a RRA, yep probably my second choice. As a matter of fact I am comtemplating a future purchase of that tactical entry upper that RRA makes.
I agree that RRA is doing what Bushmaster did 10 years ago, the little guy who is making a superior product for a low price. Their prices, however, have seemed to jump a bit to where they seem to be close to Bushmaster in price. I don't think they can do this just yet. They may have to due to whatever factors but I think it would be in their best interest to continue to try to undersell the competition for another couple of years.
Chris