I would be inclined to replace the barrel anyways. You can pick up a B&T SD barrel from HKParts.net
Sell the take out barrel or keep it for a spare. My guess is there may be some codes on the barrel but
it probably is covered by carbon deposits. You will probably have clean them off with Hoppes No. 9
,some steel wool and a carbon scrapper to get down to bare metal.
Been there done that, it was a pain trying to do that thru the cage.
I don't have the tools yet to headspace a new barrel unfortunately, and I would have to reweld a receiver to it as it's just a front end
A problem with the first batch of Omega SD's was the welding of the suppressor cage to the receiver. It was not lined up
correctly such that when people went to screw their suppressors on the cage interfered with the suppressors reaching the
threads at the base of the barrel and/or if your suppressor would screw on the canting of the cage and front sight made accuracy
poor. You had to send the receivers back to Omega for correction.
Just a thought to keep in mind. I am all thumbs when it comes to anything mechanical so all my gun projects are sent
away for building.
The front end looks like an HK German one based on the text appearing on the mag well. At the time of the problems with the
first batch of Omega SD's I seem to recall the problem was attributed to the cage being out of wack. I suppose you could search for