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Primary Weapons Systems MK111 PRO Complete AR-15 Upper .223 Wylde Gas Piston - 11.85"
DetailsThe Primary Weapon Systems MK111 PRO Complete AR-15 Upper .223 Wylde Gas Piston - 11.85" is the ultimate solution for AR pistol or SBR builds that stand out from the crowd. This complete upper receiver from Primary Weapon Systems features a 3-position adjustable long stroke gas piston...
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