Yes, the ones that Adam from HKParts sells are from Top Notch (You can see the TN in one of the pictures).
I was looking for one and was put on the list for it and of course the one time he emailed me about
him getting a few of them in I was broke!
If you're going to drop that much (Gemtech suppressor) you might as well have the barrel threaded and have a flange mounted on it.
Really, you could have the suppressor measured and have the flange built for it so that you would get the fit you wanted.
I've heard good things about the more recently made TN barrels but all I have right now is my little shorty .40 barrel.
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