I  had an Olympic barrel in this weekend to be shortened.
Whenever I get in a barrel that I don't have a drawing of, I take a few minutes to measure and document it.
When I was measuring this particular barrel, I noted that without the fake flash suppressor pressed into place that the barrel was only 15 3/4" long when measured to the breech face.
Now, the fake  flash suppressor was NOT permanently attached by any BATF approved method.
It was simply pressed on to a knurled area on the barrel and some green loctite was there.
I was able to knock the barrel out of the fake FS with a 1/2" diameter punch and just a couple hammer strikes.



If you have one of these barrels, measure the length from the breech face to the muzzle.
Beware that without the fake FS permanently attached that the muzzle is really down at the end of the rifling, about 1/2" from the end of the fake FS.
If your barrel is too short, I suggest that you have the fake FS pinned and welded into place to bring your barrel up to 16" long.

ETA: It appears that this barrel was re-worked after it left Olympic and before it came to me.
No need to call Olympic about this as they have not sold any barrels that were too short.

Good news...

Official word from Olympic via IM this morning:

Hi, I am an employee of Olympic Arms, and I can tell you categorically that the short .45 barrel you recently posted about is not a factory job. We have never used a fake suppressor like that-- our postban barrels have a ring a quarter of an inch wide recessed into the metal a quarter of an inch back from the muzzle, to facilitate using set screws to hold on a muzzle brake of our design. This brake is part number F2MB in our online catalog, and is still in production for those poor souls stuck in the more restrictive states. It appears to me that someone turned off that ring and then turned down the muzzle to allow the device to be pressed on. Feel free to contact me directly about this matter. Thanks-- Lee Webb --sales at Olympic Arms

So it appears that someone else had worked on that barrel before it was sent my way.
That kinda confirms my suspicions because I had also seen other Olympic 45 barrels and they had the standard 1/4" wide groove at the muzzle...