One of my best friends has one.
It isn't a Valkyrie Arms, it was made by a guy that makes them from the original drawings and sells them on an auction site, I think auction arms.
I have shot it a few times.
It is VERY quiet. I have a half dozen suppressed guns and/or suppressors and this is easily the quietest.
It isn't accurate for crap. At 50 yards you could probably put every shot on a human torso but that is about it. It groups about the size of a paper plate at 50 yards after pretty extensive testing of ammo/loads/possible problems with the gun........... This wasn't a quick and dirty test: he fired it quite a bit.
If you read the book
SILENCER HISTORY & PERFORMANCE, VOL II . Here is the link:
http://www.paladin-press.com/detail.aspx?ID=762 it goes into great detail about the development of the originals and upon reading that it occured to me that they wern't getting much better accuracy then by the inventor at the factory.
It also doesn't feed all that great. It works, but it isn't smooth. The magazines it takes are 1911 magazines, but they are modified 1911 magazines, which you have to buy from a manufacturer of DeLisle carbines and I am sure they ain't cheap. Repeat, these are not standard pistol 1911 magazines.
The originals were made using Thompson SMG barrels.
If you just want a suppressed carbine in .45 ACP there are a lot more practical and cheaper ways to go. But, for the history buff, the DeLisle is very cool. My buddy that owns this is a British citizen and is seriously into British WWII gear. He owns all the rifles, all the pistols, all the knives, the uniforms, a Sten, a Sterling, and a Thompson. Him buying a DeLisle was a given.