An amazing find... especially when you consider the relatively isolated/remote location and size of Paradise, CA, located in the Sierra Nevada foothills.
They kind of frown on people taking photos in the store...they ain't the Pawn Stars....
You're in the place on a fairly regular basis. You've given them money, right? To buy the gun? Or you have already bought it, but waiting to take possession of it...and they "frown" on your taking a few photos of it? That doesn't sound right.
Sounds like it's the earlier OMT if it has the adjustable front sight. The OMT front sight was adjustable for elevation and the rear sight was adjustable for windage.
At least from the mid-30s onward, I believe the heavy barrel was standard on the OMT and also the 6" barreled OPs. At least I don't remember seeing an OMT which was not a HB.By George, I think he's got it! Heavy barrel was an option or standard?