The first was a Walther MPL. The round immediately sounded different and very subdued but had enough kick to chamber and fire the second round... which was very loud. Wha-la... ringed barrel. Not bad, but non the less, a frakked up barrel. The second gun it happened to was at a shoot with my slo-fire M-11/9. The very one that started the sidecocker rage in the Mac guns. An acquaintance was running a mag or ten through the gun and I wasn't paying attention to what he was using for ammo. This time the gun made a quiet fart sound and stopped. Before I could say a thing, he racked the bolt and let it fly. Bam BAM BAM with the final bam making the guy stop and look at me. Even he knew something was outta the normal and gave me the WTF sign. Four rounds in an SWD barrel. I'm amazed it didn't blow. Just a nice deep ring just past the trunnion, so it's easily removeable. Now all I have to do is find another 10 inch Mac barrel to chop down to 8.5 inches and reassemble the gun. It still hoses kinda ok... function wise, but the accuracy is a bit wanting. Good enough for hosing at mg shoots such as Eden where nobody knows (or cares) what yer wailing away at anyhow.
All due to WWB. In a handgun... fine. In a semi HK/clone... fine. In MGs??? NFW, friends.