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"Threaded steel barrel attachment; slows the escape of propellent gasses, resulting in muffled weapon fire."
W-Y BL11 Firearm Muffler description (from Aliens: Colonial Marines - Arsenal Upgrades - NSG 23 Assault Rifle - W-Y BL11 Firearm Muffler)
The BL11 Firearm Muffler is a firearm suppressor manufactured by the Weyland-Yutani Corporation for the NSG 23 Assault Rifle.

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