Apparently "C&S Metall-Werkes" either received a letter and didn't share the details or he thought he'd "ask for forgiveness instead of permission". To me the post below says to me he isn't real big on getting his facts straight. Direct quote from the Saiga-12 forum from "C&S Metall-Werkes":
"Just some cool info on the MP5.
NASA has/had some MP5's and they record every single round that has been fired through them.
When one of their guns hit 750,000rds, they contacted HK about a new bbl. HK told them the bbl was still fine and to get a hold of them at 1,000,000rds.
At 1,000,000 HK traded a new MP5 to NASA for the 1-million rd gun and put it on display. The bbl was still good :smoke:"
As I recall from the Frank James book "Heckler & Koch's MP5 Submachine Gun", the NASA training MP5 had somewhere around 576,000 rds +/- documented rounds through it. The barrel was shot out and there was no bolt gap left with +4 rollers. HK quoted the repair to return the gun to factory spec would be within a few dollars of buying a brand new MP5 to replace it. So NASA bought new.
Apparently to "C&S Metall-Werkes" 750,000 is close enough to 576,000. I understand that they do pretty good work on drums. I certainly wouldn't buy a roller locked SBR from them if they are converting MKE guns without Tech Branch approval. Posts like:
"I think at this point in time the MKE pistol is the way to go. They are not getting bought up by the Class-2's because of the FA-bolt block....once our fix gets around, they will wind up getting scarcer as they will be bought and converted by C-2's to MP5 FA host guns."
Posts like this make me concerned. Your Mileage May Vary.
Tony Dee the armorer at the Gun Store here in Las Vegas showed me a Pre Sample MP5 that had around 2,000,000 rds through it. As I recall he said the trunion had been replaced twice and I think it was on its sixth or seventh factory barrel. With posts like these it makes me wonder the validity of any information I would get from them.
Scott