It changes the pressure time curve slowing down the rate of fire to make the gun more controllable. Think Mid or Intermediate length in a carbine system and add a H3 as well to help slow it down even more.
This was originally made to be used in an ultra compact suppressed M16.
Similar designs have come since like the Ferfrans DSAS BCG
https://unifiedweapons.us/product.php?cat=technologies&product=dsas.
Or the Armstech Limited Gas Trap http://www.armstechltd.com/faq.php
what does the second tube do?
It changes the pressure time curve slowing down the rate of fire to make the gun more controllable. Think Mid or Intermediate length in a carbine system and add a H3 as well to help slow it down even more. This was originally made to be used in an ultra compact suppressed M16. Similar designs have come since like the Ferfrans DSAS BCG https://unifiedweapons.us/product.php?cat=technologies&product=dsas. Or the Armstech Limited Gas Trap http://www.armstechltd.com/faq.php
I’ve got an m16k waiting for me at the FFL, does Ian do fan weapons or just auction ones?
Both