Angstadt Arms has released an interesting integrally silenced (suppressed, if you prefer) barrel for 9mm AR carbines. It uses a full-length barrel with venting ports (similar to the MP5SD system), combined with a tubular shroud 1.5 inches in diameter covering the entire barrel. There are no baffles; the gas behind the bullet vents into the silencer tube, expands, and then once the bullet has left the barrel is all vents back through the ports into the bore and out the muzzle. The ports are intended to both allow the silencer to function, and also to reduce muzzle velocity of supersonic ammunition to subsonic levels.
In my testing (which matches with what Angstadt has published, the velocity reduction puts most generic 115gr 9mm loadings just barely into subsonic territory, while +P ammunition remains significantly supersonic. All 147 and 150grains ammunition, however, is subsonic by a nice margin.
The Vanquish is not the quietest silencer available, but it’s far from the least quiet, and it’s remarkably economical. Angstadt offers it as a plain barrel/silencer, a complete upper, and a complete firearm, in either 10.5 inch or 16 inch length. For someone looking for a pleasant-shooting 9mm carbine for recreation or competition, I think it’s a very appealing option – less expensive than buying a silencer, barrel, and muzzle device independently and in the 16 inch configuration, a single tax stamp gun as well.
Disclosure: Angstadt send me this barrel for free, and I fitted it to a carbine I already had.
Surprisingly affordable for Angstadt, and may represent a reasonable tradeoff for some people.
I would love to put that on my AR-9 but don’t know if I will live long enough for another tax stamp to come through.
That’s what trusts are for – so your heirs can lovingly shoot your ashes out of handloads at the range – in this case very quietly.
ok- how about a vanquish barrel with a threaded muzzle so you could add a K can?
In theory such a ported-barrel silencing system should work for a shotgun too?
Even better with typical pump action shotguns, with easily switched barrel assemblies.
Hi Ian, love your work. I’d still love to see a collaboration with Jay at Pew Science on some of the things like the integrally suppressed Sten, Delisle, M3, etc. It would be fun data for the world to have and potentially see how far we’ve come.
Curious if you had the port screws in on the Vanquish during your testing or if it was fully vented? The numbers were higher than I would have suspected. I’ve also heard anecdotal info that it is good at being shot wet with the media being in the shroud and then mounted to the barrel to stay significantly more quiet for longer because of how it retains the media.
I’ve got a very unique SD type can that isn’t ported so subs still stay full velocity but also stay very quiet.
It is an interesting art form.
-Cheers and keep up the great work.