Typically on these designs, and the ported integral barrel models, the gasses are first sent into the rear chamber, usually dampened with a series of ports, tubes, or packing materials such as steel wool, etc. Then it is vented to go into the front section, which is simply a series of baffles designed to slow the escape of the gasses. The tighter around the bullet the better, with "wipes" being best in some regards, but not others.
My rule of thumb is that volume is what makes a suppressor effective, not all the fancy plumbing/ machine work. If you want to make it quiet make it bigger, and this one has utilized the area behind the muzzle to increase volume.
Porting the barrel to send the gasses directly into the rear chamber is always preferable, however it requires a dedicated unit. The best units for that app. are those with removable barrels, so you can simply remove the standard barrel and screw on a new barrel/suppressor unit. Much like those used on the S&W 76 (MK760) SMG's.
dju
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