5.56 Complete upper recommendations?

Yeah I found the SP15-M M-LOK handguard which is probably the same as what your left one is. I thought you were talking about a quad rail that was bigger diameter but I guess not?
That was the only one I've ever found that would fit my build. It's M-Loc..so rails can be added, but no..it's not a quad rail.
 
I think it’s pretty hard to argue with an Aero Precision. You can find them on sale at their party online dealers for great prices, they seem to have consistent quality and generally positive reputation. Their products also have nice design, fit and finish. Even the social media AR snobs don’t complain about them that much so you won’t have to worry about being shamed off of Facebook AR groups which is really all that matters right?
 
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