I just bought a Scoremaster in .451 DM and it came with a .45ACP barrel which is not serial numbered to the .451 DM pistol and barrel. Both barrels are 6 inches long. I only got two unidentifiable (by me) magazines. It came with a Pearce or Pierce set of rubber grips not the Pachmayr.
The reason why I decided to purchase it was that it looked in pristine condition and I don't like the Pachmayr grips anyway.

And here's the kicker it came with 500 new brass cases in .451 DM. 250 in 5 original red Detonics boxes and 250 in 5 Green RCBS boxes! I was looking at the boxes of loaded ammo online as well. So did Detonics manufacture factory ammo or not? ;-)

Let me know as I am interested in purchasing a box as well - probably from the same guy!

Ric