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More than one way to scratch that SD itch..
Upper one has an MP5k 3 lug barrel and trident (or other similar 3 lug can), I shoot subsonic through it.
Lower one is an SW SD with post sample can (you can get a good transferrable can), I shoot standard 9mm through it.
Blowback on the SW ported barrel/real SD is way worse than the trident gun.
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To my knowledge there is no such thing as a Post Sample can. The Gun Control Act of '68 limited the importation of NFA items into the U.S. And cans imported after the GCA of '68 are Pre May Dealer Samples. The Post May Dealer Samples are machineguns as the Hues Amendment only effects machinegun registration.
The fake SD (SD with a K-PDW barrel instead of the standard SD barrel) is much lower maintenance. HK recommends cleaning every 300 rounds of use for a standard SD. The biggest issue is the mounting threads at the base of the SD barrel.
About 10 years ago a member with an SD, didn't understand the cleaning regiment of the SD. There was way too much carbon built up on the mounting threads for the can at the base of the barrel. The threads of the base mount could not cut through the carbon in the threads of the barrel. Since the barrel mount threads and the end cap mounting threads to the registered tube were both right hand thread, the tube unscrewed off the base mounting end cap. That left the base mounting end cap stuck on the barrel inside the SD cage up against the trunnion. The owner was talking about sending the host gun in to a Smith and having him press out the barrel so the Smith could work at removing the SD can thread mounted base plate. Make sure to put high temperature grease on the mounting threads of the SD barrel. Even if the SD can could be unthreaded, if the is too much hardened carbon in the barrel threads, the threads can be gauled by the carbon. Once cleaned the gauled threads would be sloppy and loosened easily. A loose suppressor is not a good thing.
I love the SD. I am fortunate enough to own five. My first was a Coharie Arms SD with an all stainless steel base, baffles and registered tube with a carbon steel muzzle cap. I had Rim Country "upgrade" the baffles to anodized aluminum. That took over 1.5 lbs of the weight of the can. Sometime I like to turn the CA SD into a fake SD with a K-PDW barrel. I already have the barrel. I would just need to remove the SD barrel, press in the K-PDW barrel and pin it. Of course I would also need to change the locking peice. I have piles of such projects. Maybe when I retire in a couple of years. Good luck with the SD project. A fake SD could use the same can on both guns.
Scott