"W-Y MK221 stock replacement; contains a hydraulic counterweight system, significantly reducing the felt effects of weapon recoil."
W-Y R2 Recoil Dampening Stock description (from Aliens: Colonial Marines - Arsenal Upgrades - MK221 Tactical Shotgun - Armat A4 Stabilizing Stock)
The W-Y R2 Recoil Dampening Stock is a lightweight, expandable shotgun stock manufactured by the Weyland-Yutani Corporation for the MK221 Tactical Shotgun.



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