Do you have a link for ops parts? I could not find anything.
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http://www.operationparts.com/
I hope the OP and others get to buy all the $200 barrels they want.
Leaves the nice stuff for the rest of us.
Barrels aren't hard to find. Check out Primary arms they have Daniel Defense with or w/o gas block, delta ring, etc. Spikes(FN) Barrels.
BCM has almost all their barrels available.
Ranier has a good selection
ROG Tactical has a lot of Noveske stuff
Midwayusa has som DD barrels.
and all these places basicaly have from 10.5"-18" in stock
btw BCM standard barrels are $239.95, DD start at $279.95 for CHF barrel. Google is an amazing thing if you use it. I highly doubt you bought a NEW Quality barrel for less than $230-240. Most likely a sub-standard pos that will last 2-3000 rounds
I have seen a few 5.56 barrels under $200. Even one with a 1:7 twist. Don't remember all the specs off hand.