I would like it to have a mid-length gas system, chromed-lined, 1 in 7 twist, 16 in barrel
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Me too. I couldn't find anybody who made one.
Here's what I did find:
Mid-length, chrome-lined, but 1/9 from Armalite.
Mid-length, 1/8, stainless from RRA.
Chrome-lined, 1/7, but shorty HGs from Colt, BM, DPMS.
You could take the chrome 1/7 shorty and put on a second gas block in the mid-length position; sort of a mid-length Dissipator.
You could take a chrome 1/7 20" and cut it down to 16" sorta like a Dissipator but w/o the second gas system. (I think Troy had KKF do this.)
I couldn't find anybody that had a chrome-lined 20" w/o gas port drilled to turn into a 16" and Kurt thought the extra gas port would cause accuracy problems if he did it to one with the port.
I went with the 1/8 SS mid-length from RRA. 1/8 should be fast enough for the 75/77gr ammo (I just orded some 75gr from GPSS so I'll find out as soon as I get a free weekend). I plan to send it to KKF this fall and have it turned down to an "A2" profile.
If you can live with 69gr and lighter I'd go with the Armalite since it's already an "A2" profile.
Another option might be to go with the shorty barrel, mill the sight base so a mid-length rail system will fit over it and then put a sight on the top rail.