MDW's barrels are made by IGB in Austria. I bought his last P30 .357 regular barrel. I think he may have one for an L-version. Marc was for a long time the distributor for them. They have cut him off and IGB is in the process of setting up importation thru somebody in Florida of who I do not know. Marc lists a link to the IGB site on page 6 of the HK thread showing the variations. For those who haven't looked at the link, there are also USP barrels listed- different calibers, too. I shot my barrel in his P30 while at his house and yes- it is the real deal. If you talk to him he is a great guy. He is German and can get to talking a little fast so turn up your speaker and listen real close.
If you love something set it free. If it doesn't come back, hunt it down and kill it.
At one with the gun.