If these were M66 barrels, then they had the shrouded ejector rod, no? I was thinking they were stainless M14s with a ramped front sight, meaning exposed ejector rod.
Ever seen the fixed-sight N frame .357s made for some agency that then didn't buy them? I have seen two at shows over the years and they are odd looking. Basically a M27 with fixed sights. I think they called it the M520 but I could be wrong. Supposedly only made 500 or so. First one I saw 8-9 years ago was priced at $300. Last one maybe a year ago was at $800. Small enough run so that I guess collectors would be interested in a really nice one, but I don't how desireable it would be to most shooters.