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Need custom suppressor work

https://angstadtarms.com/product/udp9i-integrally-suppressed/

This is their design, don't know if it is available to for outside of Angstadt yet. I know that Dobbs has done 9mm integrals as I inquired earlier about one. Just don't know how busy Bryan is right now.
I read the specs on the 9mm AR rifles that were listed, how do they get the FPS down to subsonic range on 115gr ammo? I understand how it works with .22 and a barrel under 5 inches but how with 9mm?
 
Same way, just don't give the ammo a chance to accelerate to full velocity or remove pressure behind projectile. My 10/22 integral does the same thing with porting, EOS does it with a short barrel and then all the baffling. Just think of bulk 22lr as the 115 gr 9mm and it will make sense. 115 gr 9mm ammo is only 1100-1150 fps on average in pistol lengths, so just need to slow it down a little to get it subsonic.
 
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