Umarex HDB68, Heat-Core O-Ring, Problem & Fix
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Umarex HDB68, 88 Gram CO2
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Lets tear down the New Umarex Valves for the TR50, HDR68, and HDB | Did they fix the issues?!
27:54
DK Spencer builds an HDB from 5 to 70 Joules
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Get the most power from your HDR 50
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The Sabre pepper projectile launcher - First impressions and Testing (Honest Review)!
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BEST AMMO for the HDB 68
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what is important when replacing the valve pin
38:36