Quoted: how does one make sure the m4 cut barrel will align flush with the m4 feedramp upper? it seems with differing standards, the chance at aligning perfect is little to none. if this is the case, does a gunsmith finish it off by dremeling when putting the upper together with the barrel?
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i personally dremel the feed ramps on the barrel extension bit by bit until it matches perfectly with the upper. i then use a metal polishing compound on the ramps with the soft dremel wheel until it's practically a mirror. obviously, i do this before i assemble them. i do this to all my rifles with matching M4 barrel extensions and uppers. they all feed smoothly and run like raped apes on meth.
some may say to never take a dremel near an AR, but to me a rifle is a tool, nothing more. if you decide to do this, only dremel the barrel extension, not the upper. YMMV.