I'll ask you what someone here asked me, "If you are thinking about a RRA upper, why not a RRA lower and lower parts kit"? I just got mine and everything went together well in about 30 min. No missing pieces, the lower looks nice, good black color, no blemishes, markings look good. I decided on RRA because I liked their complete rifles and they have a lifetime warranty on thier rifles and uppers, etc.
I got my lower from [url=www.sableco.net]SableCo[/url] for $95 shipped, but it took me over a month to get it.
[url=www.eaglefirearms.net]Eagle firearms[/url] also has them on sale for $84.99, postban M4 stocks for $79, SA80 30 rd mags for $14.99, and ARMS # 40 for $84.99. These are really good prices, and I think I'm going to go with them for my mags and ARMS 40 (unless anyone here has a reason as why not too).
Also be sure to check with Steve at [url=www.adcofirearms.com]ADCO[/url]. I got my lower parts kit and stock from Steve. He seems like a real nice guy, the parts were in stock and shipped the next day. He also has good prices and $4 flat shipping. I am extremely happy with the stuff I got from Steve, and I will be getting my complete upper from him as well as a few other things.
I don't have any experience with the Mega lowers, but I have heard good things. You can get them fairly cheap I understand. Be sure and check the Equipment Exchange for parts too. I just thought I'd give ya my .02, and I think you cant go wrong with thr RRA, and then you'd have the same lower and upper.
Hershey