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Flip Up Front Sight & Removeable Rear Sight
though they look the same
Nylon Fiber Reinforced Polymer 2 Position Retractable Buttstock
Design for Upgrade the Origianl Slide More Durable
RA Tech URGI MK16 Steel Bolt Stop for Umarex (VFC) M4 GBB Originating-Armory_RAINIER ARMS Flip Up Front Sight &RA Tech URGI MK16 Steel Bolt Stop for Umarex (VFC) M4 GBB Steel Construction Design For Upgrade the Original Parts More Durable This Bolt Stop is also modeled after the famous MK16 style, so it would be a perfect fit for the URGI MK16 rifle builder Suitable for Umarex (VFC) M4 Series Airsoft Gas Blow Back GBB Rifle
