Quoted:
My experience has been that RRA machines its receivers to fit as snug as anyone out there. I've seen others from time to time that are also this tight but seldom see anything that isn't tight from RockRiver.
The funny thing is, that my RRA upper and lower receiver on my National Match rifle fit so tight, that I had to use a wooden dowel punch on the pin to open the rifle. BUT.....when I bought a complete LMT Defender lower and put that same RRA national match upper onto the LMT lowr, the fit was as loose as a goose in a Gay Day Parade in SanFran. Yet, I can put my Colt 6721 or Colt 6920 uppers on that same LMT defender lower and they fit super tight.
Anyway, I'm going to take the LMT defender lower with me to the gunshow to try fit- whatever AR upper I find and make sure it fits together tight.
I was just wondering which name uppers to buy and avoid, as I also don't want to make the mistake of buying something that fits tight, only to find out later that I bought a tight fitting POS. A perfect example of what I'm talking about is the DPMS for example; I've heard enough about their 5.56 stuff to know to keep away from it.
I don't profess to know about all the names out there including Stag, Bushmaster, LAR, YHM,Cardinal Forge, High Standard, etc. You know.....a lot of companies also put their own name on somebody elses stuff too. Like BCM........they don't make their own parts, they just sell it under their own name. Just like Denny puts his global Tactical name on Stag. If you guys didn't say BCM was great stuff, I'd not know it. (I still have no clue who manufactures BCM's receivers).