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You can make a pistol suppressor from seamless tubing and steel wool, threaded barrels are not uncommon or controlled. You’ll be missing the booster needed for reliability, and it’s not going to be very good, but expansion chamber volume is expansion chamber volume. Reportedly the shooter had more than one malfunction, which lends credence to a DIY can, or a shitty gun.
If the goal is murder, another +15 years for NFA violations isn’t a big deterrent.
you could probably 3d print a booster, and use a spring, I bet. it wouldn't be reliable since it'd get hot, but I don't think there would be too big an issue with too high of pressures or anything causing it to break. alternatively, you could just go with something that doesn't use a tilting or rotating or locking barrel mechanism, like a steyr GB, or even just a hi-point, which I think is just straight blowback.
you'd also probably wanna go with a mainly wipe-based suppressor rather than one with just baffles, since you're making something that's basically disposable anyways, and those can fit into smaller packages while being more effective than something with baffles.
Hell at that point you could pretty easily just 3D print the whole gun. It won't live through more than a round or two, but if that's all you need it for?
this is potentially true, though if there's any flexion or breakage in the 3d print material, you'd probably some underpressure in the cartridge, not that such a thing would matter much, or a more troubling lack of accuracy, which may be significant even at this distance, but probably not. both especially if you're not using hardware store parts. at a certain point, you do just kind of get into shinzo abe doohickey territory, with that sort of a thing, maybe easier just to use a couple pipes. on that note, you could also conceivably use a wipe-based suppression system with a classic hardware store four winds shotgun, OR a contained gas firing system, if you're going the probably over-complicated 3d printing route, especially if you avoid some larger pressures which are probably unnecessary.
you really don't need any advanced rifling or superior ballistics or anything, at the distance this guy was at. he could've even just used a knife, or a brick, or his hands, to be honest, especially since the CEO was not dressed in ballistic armor or protected in really any way. though I imagine the public would be somewhat less sympathetic to those methods since they're seen as kind of brutal or psychotic, even if they have the same end result.