Comments by "geodkyt" (@geodkyt) on "Angstadt Vanquish: An Inexpensive Integrally-Silenced 9mm AR Barrel" video.

  1. Not a whole lot you can do with a blowback 9mm AR PCC. You'll eliminate some noise by moving to the right buffer setup, just by eliminating the very AR buffer spring noise. As far as locking the bolt to make the gun a manual action, well... how are you going to pin the steel bolt to the steel barrel, in an aluminum receiver, and not have it egg out whereever you have the pin location? I suppose you could drill through the barrel nut and into the barrel itself, and have an arm that reaches back and somehow engages the bolt, but that seems like a lot of effort to badly convert a blowback 9mm PCC into a clumsy manual action. I suspect you could adapt one of these barrel/suppressor sets to a lever action POF Tombstone carbine, if you are insistent on utter silence AND 9mm.
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  2. Doesn't matter how it is marketed, nor even how efficient it is. If it reduced the sound by a detectable amount when measured by the ATF, it's legally a "silencer", and subject to the NFA if it can be attached to the barrel of a "firearm". (That last part is why certain integrally suppressed airguns aren't comsidered to have "silencers" legally, and why the various sound suppressing fixtures you might see on an range - like a firing postion with a tunnel of tires - or the test fire barrels in a gunsmith's shop aren't legally "silencers" either.) Remember, the ATF decided the moderator on the XM177 was a "silencer", despite it primarily increasing gas pressure to allow a 10.5" barrel to run more reliably... I think it only has 1 or 2 dB sound reduction.
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