I seem to recall reading that the 7xx-series carbines produced toward the end of their run had full on "M4" feedramps.
Prior to that, they had the "extended carbine" ramps.
However I wonder if the earliest 723s and 733s, back from like the early/mid 80s, had extended ramps at all.
I do love a good 7xx-series carbine discussion. My absolute favorite Retro ARs, what with me having grown up in the 80s and 90s.
Just for the hell of it, here's this:
Apparently an XM4/RO720 with one of the barrel profile options that was
not selected.
To be honest, I'm not clear what the rationale behind this profile even was. At least with the familiar M4 stepped profile you understand that it was an A2/government profile barrel, but stepped to facilitate mounting of the M203.
With the profile pictured, I really don't know what they would have been going for.
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