I'm starting my first build with a lower from 80% Arms, and I'm not sure about (or if it even matters...) what my options are for uppers.  They recommend DPMS or CMMG only, but I've seen a couple of builds using uppers from other companies.  Are there any issues with fit and/or functionality that I should be aware of?  Any recommendations (I'm flexible on price points)?  Thanks for helping a newbie out.

and lastly, they sell all sorts of brands of uppers on the site. pretty sure they are assuming people will buy those they sell or other brands to put on their lowers.



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To clarify, I am in fact talking about 5.56...but I do have a .308 to do after this one.

Thanks for the info. I purchased the lowers last year, so cost is something of a moot point. But it's good to know there are options for future builds.

Any brand upper should fit.... 223, 5.56, Wylde, 300blk, 6.8, 6.5, 7.62x39, just not a 308.

Any mil spec upper for ar15 but their .308 is dpms pattern (there is a few ar-308 types) instead of armalite ar10. I believe that's the only time the distinction matters. And there are more than a few company's making dpms pattern rifles. The prices are steep but their jig is second to none.....except for .308 jig. In that regard modulus wins with only universal jig I have seen. I suppose I will "just have to" buy that next. Black gun fever...its my cross to bear lol

Thanks for the help everyone!  I appreciate the clarification.