EDIT:

Found one. Thanks!
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I am looking to buy an 18" M4 barrel w/mid-length gas port.
Doesn't need to be chrome lined. FSB on or off, doesn't matter.
Would prefer a heavy profile, but I'm not married to it. A stainless steel barrel would be a big plus.
New would be very nice, but lightly used and well cared for will be seriously considered.

I'm looking to spend somewhere in the ballpark of $200-250, possibly up to $300 for a new SS.
A 20" as described above would also be desirable, but would be a second choice.

PM me with a pic and a price. Let's make a deal!