Suppressor - Baffles and Spacers
Read More: http://en.wikipedia.org/wiki/Suppressor
Baffles are usually circular metal dividers which separate the expansion chambers. Each baffle has a hole in its center to permit the passage of the bullet through the suppressor and towards the target. The hole is typically at least 1 mm larger than the bullet caliber to minimize the risk of the bullet hitting the baffle in what is known as a "baffle strike". Baffles are typically made of stainless steel, aluminium, titanium, or alloys such as Inconel, and are either machined out of solid metal or stamped out of sheet metal. A few suppressors for low-powered cartridges such as the .22 Long Rifle have successfully used plastic baffles.
There are several unique baffle designs. M, K, Z, monolithic core and Ω (Omega) are the most prevalent. M-type is the crudest and composes an inverted cone. K forms slanted obstructions diverging from the sidewalls, creating turbulence across the boreline. Z is expensive to machine and includes "pockets" of dead airspace along the sidewalls which trap expanded gases and hold them thereby lengthening the time that the gases cool before exiting. Omega forms a series of spaced cones drawing gas away from the boreline, incorporates a scalloped mouth creating cross-bore turbulence, which is in turn directed to a "mouse-hole" opening between the baffle stack and sidewall.
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